11/11/2002 - 13:00
A Cosserat Detector for Dynamic Geometry It is proposed to explore the interaction of weak gravitational fields with slender elastic materials in order to assess the viability of achieving enhanced laser interferometric sensitivities for the detection of gravitational waves with frequencies between 1e-4 and 1 Hz. The aim is the design of novel gravitational antennae in interplanetary orbit. The implementation of these ideas would be complimentary to existing programmes of gravitational... Robin Tucker |
07/11/2002 - 13:00
Molecular outflows in high-mass star-forming regions: the extreme case of IRAS 20126+4104 As part of an outflow study in high-mass star-forming regions we observed the outflow in 20126+4104. It molecular outflow shows extremely high-velocity gas that extends in velocity more than +/- 50 km/s from the LSR. Comparing the different velocity components with the previously observed SiO jet, we found different orientation between the jet and the outflow that we interpret due to a precessing jet. The energetic of the outflow and it effects... Mayra Lebron |
09/10/2002 - 14:00
The Legacy of the HST for Studies of Stellar Populations in the Local Group Over the past 10 years, most of the galaxies in the Local Group have been observed by the HST for the purpose of studying their stellar populations. I will present a summary of some of these observations, and describe some of the key scientific questions that have been addressed with these data. I will focus on the issue of derived star formation histories of Local Group galaxies, giving my perspective of the important issues, some of the... Prof. Jon Holtzman |
04/10/2002 - 14:30
Modelization of the giant HII regions NGC588 and NGC595 Tbd Luc Jamet |
04/10/2002 - 14:00
Investigating the Starburst-AGN connection Tbd Lucimara Martins |
03/10/2002 - 14:00
The evolution of stars and gas in Starburst galaxies Tbd Roberto Cid Fernandes |
02/10/2002 - 14:00
Dust: a solution to the temperature fluctuation problem in photoionized nebula? Tbd Grazyna Stasinska |
01/10/2002 - 14:00
Mass accretion to supermassive blackholes in the nuclei of galaxies Tbd Thaisa Storchi-Bergmann |
30/09/2002 - 14:00
Jet directions in AGNs Tbd Henrique Schmit |
26/09/2002 - 14:00
Afterglows of gamma-ray bursts Ever since the first fading counterpart of Gamma Ray Burst (GRB) was discovered in 1997 there had been tremendous progress in our understanding of GRBs both in observation and theory. In this talk I will summarize the various aspects we learnt from multi-band observations of GRBs as well as the open issues. I will mention the contribution fron Indian observatories and particularly the observations I carried out at Vainu. S.G. Bhargavi |
24/09/2002 - 28/09/2002
Star Formation through Time Star Formation through Time Granada |
17/09/2002 - 14:00
Remanente de supernovas, estrellas de neutrones y el medio interestelar Tbd Gloria Dubner |
15/07/2002 - 14:00
The feeding of monsters - a study of nearby active galaxies The understanding of the nature of AGNs and the galaxies hosting them belongs to one of the most interesting topics of modern astrophysical research. Especially the fueling mechanisms of the central black hole - supposed to be responsible for the enormous activity in these objects - raise a wealth of unanswered questions. The so called NUGA (NUclei of GAlaxies) survey an international collaboration and the Cologne Nearby QSO sample aim at... Melanie Krips |
03/07/2002 - 14:00
Luminous Vs. dark matter in the inner parts of bright spiral galaxies The inner part of the rotation curve is crucial in determining the nature of the dark matter. The shape of the dark spherical halo is determined by the central density and the core radius. Haloes built up by hierarchical merging in dark matter cosmogonies are cusped and dominated by dark matter at the very centre. These characteristics seem to disagree with a number of observations. The number of subhaloes around typical galaxies, as identified... Isabel Pérez |
25/06/2002 - 14:00
Everything you always wanted to know about the isolated galaxy NGC 4414 but were afraid to ask. Tbd Jonathan Braine |
12/06/2002 - 14:00
A review of the fundamental problem of galactic dynamics The dynamics of stellars systems is fully specified by its distribution function - the phase density of its consistuent stars - and the form of the gravitational potential that binds it together. The so-called fundamental problem of galactic dynamics is the recovery of this information from the observable properties of a galaxy. I will review past results concerning this problem in the spherical and axisymmetric geometry. Finally I will show my... Anne Mathieu |
27/05/2002 - 14:00
Evolución química en galaxias enanas esferoidales y su importancia en el medio intergaláctico del Grupo Local Se han modelado quimicamente 4 galaxias enanas esferoidales (dSph) satelites locales a partir de historias de formacion estelar obtenidas de sus diagramas HR. Se encuentran restricciones sobre la cantidad de materia oscura en estas galaxias, los tipos de vientos galacticos acontecidos y detalles de la tasa de la formacion estelar en los primeros tiempos evolutivos. Basandose en el material expulsado por el bulbo Galactico y por las galaxias... Leticia Carigi |
24/05/2002 - 14:00
Star formation, gas cycles and the chemical evolution of dwarf irregular galaxies Because of their low gravitational energies dwarf galaxies are greatly exposed to energetical influences from internal and external sources. In gas-rich dwarf irregular galaxies not only that star formation regulates itself due to the stellar energy release, but also supernova-driven galactic winds are accepted as a general explanation for their low metallicities. Chemodynamical models of dIrrs that take the dynamics of different gas phases and... Gerhard Hensler |
17/05/2002 - 14:00
Hipparcos y la población estelar temprana de la vecindad solar: Estructura vertical galáctica, la burbuja local y extinciones masivas. The availability of Hipparcos data has revolutionized astrometry. The impact has been felt more strongly in those fields where there is a significant number of objects within 200 pc, which corresponds to the maximum distance at which individual Hipparcos parallaxes can be considered accurate. However, objects located further away can still be analyzed with Hipparcos when one considers the measurements in a statistical sense. Here I discuss some... Jesús Maíz Apellániz |
14/05/2002 - 14:00
La compleja vida de las galaxias elípticas We present a simple phenomenological model of feedback in early-type galaxies that tracks the evolution of the gas content, metallicity and temperature. Modeling the star formation rate as a Schmidt law with a temperature-dependent efficiency, we find that intermittent episodes of star formation are common in moderate-size ellipticals. This departure from a standard scenario of passive evolution implies significantly younger luminosity-weighted... Ignacio Ferreras |
10/05/2002 - 14:00
Gas molecular y formación estelar en galaxias enanas de marea Tidal Dwarf Galaxies (TDGs) are created during a violent interaction of galaxies containing at least one spiral. Atomic hydrogen is torn off a spiral and star formation takes place in this gas which accumulates at the ends of tidal tails. TDGs typically contain two main stellar components: young stars recently formed by collapse of expelled HI clouds, and an older stellar population, at least 1 Gyr old, which was pulled out from the disk of the... Ute Lisenfeld |
25/04/2002 - 14:00
Nuclear star clusters in late-type spirals I will summarize the results of our recently completed HST/WFPC2 I-band survey of a sample of 77 nearby, late-type spiral galaxies with low inclination. The main purpose of this catalog is to study the frequency and properties of nuclear star clusters in this class of galaxies. We find that at least 75% of late-type spirals harbor a distinct, compact (but resolved), and dominant star cluster at their photocenter. From an isophotal analysis, we... Torsten Boeker |
24/04/2002 - 14:00
New results from Plateau de Bure Tbd Michel Guelin |
17/04/2002 - 14:00
Solar Terrestrial Physics Laboratory at CRESS, York University, Canada Tbd Stoyan Sargoytchev |
16/04/2002 - 14:00
La calibración de ALMA: Efectos atmosféricos, su modelización, medida y estrategias de corrección El proyecto ALMA exigirá grandes esfuerzos tanto en el dominio técnico como en el de la modelización que deberá simular o tratar ciertos efectos. Uno de los problemas a abordar es el de los efectos atmosféricos sobre las observaciones: atenuación, contribución a la temperatura de sistema, fluctuaciones de la fase... Disponer de un modelo lo más preciso posible de dichos efectos atmosféricos y trabajar sobre las estrategias más convenientes para... Juan Ramón Pardo |
02/04/2002 - 14:00
Dwarf Galaxies: the building blocks of the Milky Way? In hierarchical clustering scenarios of galaxy formation, such as cold dark matter-dominated cosmologies (White and Rees 1978), dwarf galaxies should have formed prior to the epoch of giant galaxy formation and would be the building blocks of larger galaxies. The picture of building the Galactic halo from merging ``fragments'', which Searle and Zinn (1978) proposed on the basis of the properties of the Milky Way globular clusters, is regarded as... David Martínez Delgado |
20/03/2002 - 13:00
Astronomy in Egypt Tbd Anas Osman |
13/03/2002 - 13:00
La evolución del He4 y del Helio primordial En esta charla voy a revisar la evolución del 4He en el Universo, con un énfasis particular en la determinación de la abundancia de Helio primordial Y_P y sus implicaciones cosmológicas. Discutiré las determinaciones más recientes de Y_P, y las incertidumbres que las afectan. Valentina Luridiana |
04/03/2002 - 13:00
Proyecto ALMA Tbd José Cernicharo |
05/02/2002 - 08/02/2002
Ciencia con el GTC Ciencia con el GTC Granada |
29/01/2002 - 13:00
Los cometas y el agua terrestre Resultados de observaciones cometarias recientes han estimulado varias hipotesis nuevas sobre el origen de la materia volatil terrestre, incluyendo el agua, moleculas organicas y gases nobles. Se ha sugerido (por ejemplo, Owen and Bar-Nun 1995 y 2000, Delsemme 1999) que los cometas son la fuente principal del agua y de las primeras moleculas organicas terrestres. Por otro lado, Swindle y Kring (2001) se basan en la abundacia de Argon observada... Humberto Campins |
15/01/2002 - 13:00
Estrellas, emisión multirango y estadística: hacia una nueva generación de modelos de síntesis Los modelos de sintesis evolutiva son una herramienta que se aplica para determinar las propiedades fisicas de un amplico rango de objetos, desde cumulos estelares a galaxias a distancias cosmologicas. Su principal ventaja es la capacidad de obtener las propiedades promedio de sistemas estelares en funcion de cierto numero de parametros y la capacidad de comprobar nuestro conocimiento sobre la teoria de evolucion estelar mediante la comparacion... Miguel Cerviño Saavedra |
09/01/2002 - 13:00
El gas más caliente en nebulosas planetarias: revelaciones en rayos X y UV Las nebulosas planetarias son el resultado de la evolucion de estrellas de masa baja e intermedia. El modelo mas aceptado para explicar la formacion de las nebulosas planetarias es el de la interaccion entre el viento estelar rapido y tenue que emana de la estrella central con el viento lento y denso que se eyecto en fases anteriores de la evolucion estelar. Una de las predicciones basicas de este modelo es que el viento estelar en el interior... Martin A. Guerrero |
18/12/2001 - 13:00
The Martian atmospheric evolution: implications for the planetary water inventory The study of Mars and its planetary water inventory is particularly interesting because this planet is similar to Earth in many ways. Observations by various spacecraft in the past and more recently by Mars Global Surveyor showed the probable existence, at least in the past, of large quantities of liquid water on the Martian surface or in subsurface layers. Surface features resembling massive outflow channels provide evidence that the Martian... Helmut Lammer |
17/12/2001 - 13:00
Searching for signatures of life on extra-solar plantes The direct detection of terrestrial extra-solar planned should be possible in the next 10 or 20 years. It is the main purpose of two space missions: Darwin (ESA) and TPF (NASA). Moreover, assuming a detection of such a planet, these telescopes should also be able to perform low-resolution spectra of this new world and therefore to infer the presence of atmospheric compounds. I will discuss the exobiological implications of these extrasolar... Franck Selsis |
22/11/2001 - 13:00
Cúmulos estelares en regiones de HII extragalácticas This talk deals with properties of very young (< 10-20 Myr) stellar clusters which are in the nebular phase and are embedded in photoionized regions (classical extragalactic HII regions (RHIIs) or starburst galaxies). Based on the analysis of the integrated light of these clusters at the UV and optical wavelengths, different techniques are discussed that allow to estimate in consistent the stellar content and the evolutionary state of the... Rosa González Delgado |
16/11/2001 - 13:00
The Rayleigh ellipsoid approximation. A poor man's approach to the extinction of electrogmanetic radiation by small particles. Tbd Andrzej Jurewicz |
14/11/2001 - 13:00
Non-adiabatic eigenfunctions in the atmosphere of pulsation stars: a tool for better mode identification. In this seminar, an overview of the utility of studying non-radial non-adiabatic oscillations of stars such as $\delta$ Scuti, $\beta$ Cephei and Slowly Pulsating B stars will be given, with a particular attention on the problem of mode identification. Then I will present in more details the particularities of the non-adiabatic code I have written, which is mainly the special care given to the modelling of the pulsation in the atmosphere. Antoine Dupret |
07/11/2001 - 13:00
Enigmática expulsión esférica de materia en un embrión estelar. ALMA, una gran espectativa. Tbd José María Torrelles Arnedo |
06/11/2001 - 13:00
The Hamburg/SAO survey for low metallicity BCGs (HSS-LM) The description and the first results of the new project will be presented. It is devoted to the search for the most metal-deficient blue compact galaxies. The first goal is to extend the sample of the most interesting candidates to truly young galaxies in the local Universe, and study them in detail. The second goal of the project is to create a large, clearly selected sample of BCGs with reliably measured O/H. The data will be used for the... Simon Pustilnik |
24/10/2001 - 14:00
Acreción y pérdida de masa cerca del límite subestelar LS-RCrA 1 es una estrella de tipo espectral muy tardío (M6.5-M7) cuyo espectro muestra líneas de emisión muy intensas, tanto prohibidas como permitidas. La estrella parece encontrarse en una región de formación estelar, lo que explicaría la presencia de las líneas, pero su posición en el diagrama HR, teniendo en cuenta las trazas evolutivas calculadas para estrellas de muy baja masa, difiere de la esperada. Matilde Fernández |
02/10/2001 - 14:00
The evolution of galaxies in different cosmological environment According to the hierarchical scenario, galaxies form via merging and accretion of small objects. Within a series of high resolution simulations we have studied the formation and evolution of dark matter halos hosting galaxies. First halos have been formed at z > 10. We have studied the evolution of isolated halos (field galaxies) as well as of halos in dense regions (galaxies in groups or clusters and galaxies with satellites) and of small... Stefan Gottloeber |
26/09/2001 - 14:00
Perspectivas científicas con VLBI a longitudes de onda milimétricas Tbd Antxon Alberdi |
12/09/2001 - 14:00
Interacción de meteoroides con las atmóferas de Marte y Titán Tbd Gregorio Molina |
04/07/2001 - 14:00
El instrumento OSIRIS de la misión Rosetta Tbd Rafael Rodrigo |
28/06/2001 - 14:00
The problem of stability of internal spaces in multidimensional cosmology We investigate effective 4-dimensional theories which were obtained under dimensional reduction of multidimensional cosmological models. We show that for warped product spacetimes the conformal (geometrical moduli) excitations of the internal spaces should be observable as massive scalar fields in the external (our) spacetime. These scalar fields (gravitational excitons) describe weakly interacting particles and can be considered as dark matter... Prof. Alexander Zhuk |
27/06/2001 - 14:00
High-Energy Emission from Relativistic Jets in Blazars We have been observing a number of blazars with the Very Long Baseline Array in concert with monitoring at other wavebands, including X-rays and gamma-rays. Observations over several years demonstrate that there is an intimate connection between the ejection of apparent superluminal knots in the relativistic jets and X-ray or gamma-ray flares in blazars. The high-energy emission tends to be simultaneous with or even to follow the radio event,... Prof. Alan Marscher |
26/06/2001 - 14:00
Some aspects of the upper atmosphere of Mars: ionosphere, airglow, meteors. The comparative study of the planetary atmospheres is a young and interesting science, because of the diversity of the situations. As part of this programme, the exploration of Mars is very challenging. This talk concerns more particularly the modeling of the Martian ionosphere, in the context of the future missions to Mars (Mars-Express, Nozomi, Netlander, Mars 2007). The ionospheric model is based on a terrestrial coupled kinetic and fluid... Olivier Witasse |
22/06/2001 - 14:00
Panorama de la Gravedad Cuántica El objetivo fundamental de esta charla es promover un acercamiento entre las comunidades observacional y teórica de este Instituto. Con la sensibilización como meta previa, se realizará un recorrido por la situación actual de la investigación en Gravedad Cuántica, enfatizando los aspectos conceptuales de las principales aproximaciones al problema y motivando las correspondientes soluciones técnicas. José Luis Jaramillo |
18/06/2001 - 20/06/2001
The Evolving Sun and its Influence on Planetary Environments The Evolving Sun and its Influence on Planetary Environments Granada |
13/06/2001 - 14:00
Unificación no trivial de las fuerzas electromanéticas y gravitatorias El principio de mínima interacción es revisado en un marco grupoteórico. Al imponer la invariancia "local" bajo traslaciones espaciotemporales del lagrangiano de la partícula libre después de haber extendido centralmente el grupo de Poincare por U(1) (invariancia de fase en Mecánica Cuántica) aparece una nueva fuerza de tipo electromagnético pero de origen puramente gravitatorio. Esto constituye un paso hacia la mezcla de simetrías... Víctor Aldaya |
08/06/2001 - 14:00
Corrugaciones En esta charla se hará una revisión del concepto de corrugación como fenómeno universal que afecta a los discos de las galaxias espirales y se plantean diversas estrategias para dirimir su origen y estructura. Emilio Alfaro Navarro |
23/05/2001 - 12:00
Retrieval of atmospheric parameters from MIPAS/ENVISAT emission spectra at 5.3 um under non-LTE conditions In (hopefully) 5 months ESA's polar platform ENVISAT will be launched. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is one of the core instruments and will continously record high resolution emission spectra of the Earth's atmosphere. Vertical profiles of temperature and various trace gases relevant to stratospheric chemistry are planned to be retrieved from the data. The talk will give a summary on the status of the... Bernd Funke |
18/05/2001 - 14:00
Evolution of Pulsar Magnetic Fields Because canonical neutron stars consist mainly of superfluid neutrons, superconducting protons and extremely relativistic electrons, all enclosed by a thin solid crust, the magnetic field structures of these stars vary in predictable ways during stellar spin-up and spin-down. Predicted consequences will be compared to a variety of observations of regular and millisecond pulsars including sudden changes in pulsar spin-periods ("glitches... Prof. Malvin Ruderman |
09/05/2001 - 14:00
Procesos de 'scattering' múltiple en comas cometarias Los modelos dinámicos multifluido realizados hasta la fecha para el cálculo de la distribución de gas y polvo en las comas cometarias rodeando núcleos no esféricos no tienen en cuenta el efecto del "scattering" múltiple de la luz solar por las partículas que rodean al cometa. Nuestras estimaciones indican, sin embargo, que la profundidad óptica en el visible en condiciones subsolares, en las comas de ciertos cometas con elevado... Fernando Moreno |
02/05/2001 - 14:00
Recent Water Activity on the Surface of Mars There are two known reservoirs of water on Mars: the atmosphere, and the north polar cap. The latter contains possibly as much as 10 meters of water (global ocean equivalent). What happens to this water at high obliquity? Mars' obliquity varies chaotically on time scales greater than 10 million years and may have been as high as 60 degrees. We use a general circulation model with a simple hydrological cycle to address this question. We find that... Robert Haberle |
24/04/2001 - 14:00
Seminario-coloquio Seminario-coloquio Prof. Dr. Stephen Hawking |
18/04/2001 - 14:00
Is the universe fractal or homogeneous on large scales? The debate about the possible smoothness of the Universe on large scales as opposed to an unbounded fractal hierarchy has been the subject of increasing interest in recent years. The controversy arises as a consequence of different statistical analyses performed on surveys of galaxy redshifts. I review the observational evidence supporting the idea that a gradual transition occurs in the galaxy distribution: from a fractal regime at small scales... Vicent Martínez |
04/04/2001 - 14:00
Arc-shaped star complexes in galaxies There exist isolated star complexes , located sometimes far away from the center of a galaxy or from the spiral arms. These complexes often have spheroidal or arc-like shapes. The best examples are in the LMC, NGC 6946 and NGC 5236. This shape strongly suggests triggering by some energetic events. The striking feature of these complexes is their sharp and circular outer edge. This suggests they are partiall spheres and could be formed from the... Yuri N. Efremov |
21/03/2001 - 13:00
Stephan's Quintet: Anatomy of a Multiple Galaxy Collision. We present old and new unpublished multiwavelength data for the most famous compact group of galaxies. Such groups are ideal laboratories for studying the effects of strong interactions. The data suggest an evolutionary history that may have general relevance to the compact group phenomenon and to interaction phenomena in the early Universe. The data suggest that SQ has been visited by two intruders in the past Gyr. The first intruder stripped... Jack Sulentic |
16/03/2001 - 13:00
Moléculas y anillos aromáticos en el espacio Tbd José Cernicharo |
08/03/2001 - 13:00
Un método para la alineación del telescopio de 1.5m de San Pedro Mártir Tbd Leonel Gutiérrez |
07/03/2001 - 13:00
WeCAPP: Wendelstein Calar Alto Pixellensing Project: Capturing dark matter in M31 I present (WeCAPP) our long time project searching for microlensing events in M31. Since 1997 the bulge of M31 was monitored in two different wavebands with the Wendelstein 0.8 m telescope. In 1999 we extended our observations to the Calar Alto 1.23m telescope. Observing simultaneously on these two sites we obtained a larger than 60% time coverage of the visibility of M31. To check thousands of frames for variability of unresolved sources, we... Arno Riffeser |
21/02/2001 - 13:00
El campo magnético de las manchas solares En esta charla trataré de repasar y resumir nuestros conocimientos más actuales acerca del campo magnético de las manchas, de su estructura tridimensional, del transporte energético a través de su atmósfera, así como de las relaciones del campo magnético con los fenómenos dinámicos más importantes que tienen lugar en la fotosfera de las manchas. José Carlos del Toro Iniesta |
15/02/2001 - 13:00
Eigenvector 1: An H-R Diagram for AGN? Most Active Galactic Nuclei (AGN) are characterized by the presence of broad emission lines. However the AGN definition includes a wide range of phenomenologies, both radio-loud and radio-quiet. We report on exciting new developments that unify all classes of AGN showing broad lines. Correlations in this "Eigenvector 1" parameter space appear to be driven primarily by the accretion rate onto the supermassive black holes that power... Jack Sulentic |
07/02/2001 - 13:00
Eyecciones colimadas en nebulosas planetarias y estrellas centrales binarias En la eyección de muchos de los flujos colimados observados las nebulosas planetarias parecen estar involucradas estrellas binarias. Sin embargo, el número de estrellas centrales binarias que se conocen es escaso y la detección de binarias puede ser difícil observacionalmente. Una forma de inferir la presencia de una estrella central binaria es estudiar su influencia en las propiedades nebulares. Presentamos dos nebulosas planetarias (IC4846 y... Luis F. Miranda |
31/01/2001 - 13:00
INTEGRAL: El Observatorio Astronómico Europeo de Altas Energías En Abril de 2002 está previsto el lanzamiento de la misión INTEGRAL de la ESA, que operará durante al menos 5 años cubriendo todo el rango desde los 3 keV hasta los 10 MeV, con una sensibilidad sin precedentes a Altas Energías, lo que permitirá investigar nuevos fenómenos violentos en el Universo. Las propuestas para el Primer Anuncio de Oportunidad se han de presentar antes del 16 de Febrero de 2001. Alberto Castro Tirado |
26/01/2001 - 13:00
X-ray induced chemistry in translucent molecular clouds Tbd Roland Gredel |
16/01/2001 - 13:00
Non-cumulative geometry in fundamental interaction theories Tbd Jerzy Lukierski |
10/01/2001 - 12/01/2001
Workshop on QSO HOSTS AND THEIR ENVIRONMENT Workshop on QSO HOSTS AND THEIR ENVIRONMENT Granada |
20/12/2000 - 13:00
Modelos análogos de relatividad general La propagación de una onda en el espaciotiempo viene modificada por las características métricas particulares de la región que atraviesa. Muchos de estos comportamientos pueden, en principio, simularse en un laboratorio con el uso de ondas que se propagan ahora a través de sistemas de materia condensada. A este respecto, los condensados de Bose-Einstein son muy prometedores. Veremos bajo qué circunstancias se puede obtener una métrica efectiva... Carlos Barceló |
13/12/2000 - 13:00
Observación e interpretación de destellos de impacto en la cara nocturna de la Luna Tbd José Luís Ortiz |
05/12/2000 - 13:00
PETI: el PEqueño Telescopio del IAA Con esta charla pretendemos presentar "oficialmente" el PETI, un telescopio de tipo Schmidt-Cassegrain, de 25 cm de apertura, situado en la azotea del IAA. Comentaremos algunas posibles aplicaciones del instrumento, detallaremos sus características técnicas y realizaremos una simulación de observación remota desde el salón de actos. Drs. Lucas Lara & José Luis Ortíz |
29/11/2000 - 13:00
Inducción de la actividad en galaxias Se revisan los mecanismos generalmente invocados para explicar el origen de la actividad nuclear en galaxias, con especial énfasis en aquellos que han de operar en el caso de galaxias que no están en interacción gravitacional, como son las barras. Entre otros resultados, se presentan los correspondientes al estudio comparado de una muestra de galaxias espirales aisladas con y sin núcleo activo, de morfologías similares. Por un lado, se... Isabel Márquez |
22/11/2000 - 13:00
Star formation in the outer Galaxy: Discovery of very distant young embedded clusters. We report discovery of two distant embedded young stellar clusters located far in the outer Galaxy. The clusters are resolved in near-infrared images and seen as enhancements in the surface density of IR-excess stars centered close to IRAS 07255-2012. The clusters are embedded in a molecular cloud containing a CS dense core. The molecular cloud, as traced by CO (J=1-0) is elongated and extends over a region of 15x6 pc2. From the millimeter... Joao L. Yun |
15/11/2000 - 13:00
Molecular gas in powerful radio galaxies: major or minor mergers? We will discuss the detection of CO(1-0) and CO(2-1) emission, with the IRAM-30m telescope, from the central regions (5-10 kpc) of powerful radio galaxies. Their individual CO emission exhibits a double-horned line profile that is characteristic of an inclined rotating disk with a central depression at the rising part of its rotation curve. The inferred disk or ring distributions of the molecular gas is consistent with the observed presence... Stephane Leon |
10/11/2000 - 13:00
The influence of physical parameters of the surface of nucleus and dust and gases in the coma on cometary spectra A review of the main causes of changes of cometary radiance spectra is given in this paper. In the study various states of the surface of nucleus and dust and gases in the coma are considered. The influence of the gases, materials, the dimensions and temperature of grains on the surface of the nucleus and in the inner coma are analysed. The influence of solar irradiance and zenith angle are also taken into account. Some remarks how to... María Blecka |
07/11/2000 - 13:00
Partículas de polvo no esféricas en el espacio Las partículas de polvo con geometrías irregulares juegan un papel muy importante en la astrofísica del Sistema Solar y otras zonas del espacio como el polvo interestelar, discos protoplanetarios etc. Las propiedades de scattering de las partículas esféricas pueden ser calculadas mediante la teoría de Mie, sin embargo, no existe ningun método que nos dé la solución exacta para el scattering de luz de partículas irregulares cubriendo todos los... Olga Muñóz |
02/11/2000 - 13:00
Actividad estelar. Ciclos de actividad en AB Doradus. En la primera parte de esta charla comentaré un poco, y de forma muy general, sobre la actividad magnética en las estrellas y, en particular, sobre una de sus manifestaciones, como son las manchas, tanto en el Sol como en otras estrellas. Se explicarán algunos de los métodos de detección de las manchas estelares y de determinación de sus parámetros físicos. En una segunda parte, comentaré sobre los ciclos de actividad determinados a partir de... Pedro Amado |
25/10/2000 - 14:00
Matrices para polarimetría Como la descripción del estado de polarización de la luz policromática precisa de la especificación de 4 parámetros (en realidad, tres parámetros libres más una condición de ligadura), el formalismo más empleado es el de los (4) parámetros de Stokes. En él, el estado de polarización se especifica con un cuadrivector y sus transformaciones lineales con matrices 4x4, llamadas de Mueller. Además, a la hora de medir en la práctica los cuatro... José Carlos del Toro Iniesta |
18/10/2000 - 14:00
The close environment of star-forming dwarf galaxies - nearby dwarf companions as possible starburst triggers? Tbd Kai Noeske |
11/10/2000 - 14:00
Separation of atmospheric and surface spectral features in Martian spectra Dust aerosols are always present in the Martian atmosphere . They can substantially modify the spectral features of surface spectra observed from orbiting instruments. It might be then difficult to determine the relative contributions of surface emissivity and atmospheric opacity to observed spectral features. The strong dependence of the emission (or reflectance) spectra on the roughness of the surface and the size of the dust grains seems to... A. Jurewicz |
04/10/2000 - 14:00
X-rays from young, late-type stars: quiescent and flare state The public ROSAT archives offer a unique possibility to study the X-ray emission of large samples of young stars in a consistent way. In this talk a systematic search for X-ray emission from pre-main sequence and zero-age main sequence stars based on pointed ROSAT PSPC observations will be presented. The comparison of the X-ray properties of sequence and zero-age main sequence stars based on pointed ROSAT PSPC observations will be presented... Beate Stelzer |
27/09/2000 - 14:00
Formación Estelar Violenta en Galaxias La relevancia cosmológica de los Starbursts se ha puesto de manifiesto en los últimos años tras el descubrimiento de una población significativa de galaxias muy lejanas que se encuentran en una fase muy activa de formación estelar. Las características de estas galaxias son muy similares a las galaxias starburst de nuestro universo local. Este hecho da más ímpetu al estudio de las galaxias starburst como bancos de prueba para entender la... Rosa M. González Delgado |
18/09/2000 - 14:00
Neutral Hydrogen in Spiral Galaxies I will present a brief review of the main HI properties of isolated, normal spiral galaxies and of the phenomena which characterize and dominate their internal metabolism. In particular, I will present and discuss new results on the HI halos and on the HI disk-halo connection. Finally I will draw attention to all those processes, such as tidal interactions, HI accretion and mergers, which depend on the galaxy environment and may play a... Renzo Sancisi |
17/09/2000 - 20/09/2000
XXXII Young European Radio Astronomer's Conference XXXII Young European Radio Astronomer's Conference Granada |
14/09/2000 - 14:00
Early Mars and Early earth I will talk about some comparative aspects of the evolution of Mars and Earth. Today, the surface of Mars appears dry and lifeless, and the atmospheric composition is defined by chemical processes. In contrast, the Earth's atmosphere has evolved to one heavily influenced by life with a substantial level of biologically-produced O2. Pictures from NASA's Mars Global Surveyor (MGS) spacecraft show cross-sections of the ancient Martian crust... David Catling |
11/09/2000 - 13/09/2000
THIRD MICROQUASAR WORKSHOP THIRD MICROQUASAR WORKSHOP Granada |
18/07/2000 - 14:00
Ground-based Detection of Circumnuclear Keplerian Disks of Ionized Gas in Disk Galaxies We have studied the gas kinematics in the inner regions of a sample of 23 disk galaxies obtained from long-slit spectra along their major axis. We discuss the variety of the shapes of the emission lines in the position-velocity diagrams that we find for the sample galaxies. For some objects we demonstrate the possibility of inferring the presence of Keplerian gaseous disks using optical ground-based telescopes. José Funes |
05/07/2000 - 14:00
Variable tipo delta Scuti: catálogo 2000 En esta charla se presentará el nuevo catálogo que ha construído el grupo de Física Estelar del IAA para variables pulsantes tipo delta Scuti. Este catálogo está actualizado hasta Enero del 2000 e incluye también las variables tipo SX Phe de campo conocidas. De hecho, la última variable incluida en la lista fué descubierta por nuestro grupo en el OSN el 29 de Enero de este año. El nuevo catálogo incluye 636 variables, 1149 referencias y 182... Eloy Rodríguez |
28/06/2000 - 14:00
La nueva red del IAA Tbd Antonio Ruíz Falcó |
26/06/2000 - 14:00
The Morphological Evolution of the spiral galaxies Do the spiral galaxies still evolve? Abundance gradient is a powerful tracer of the galactic evolution. It the past, it as been demonstrated that large scale flow of gaz induce by bar can flatten the gradient. In some case, some bars are so young that the mix process did not had the time the reach all the disk. At the opposite, the flat abundance gradient of early type-spiral betray the existance of a bar, which has now disapear. Yvan Dutil |
21/06/2000 - 14:00
Living on the edge: Cosmology at the edge of anti de Sitter space String theory, which is supposed to be the fundamental theory of quantum gravity, has now mutated into membrane theory (brane theory), and given rise to some peculiar cosmological models called "brane cosmologies". In these models our entire observable universe is supposed to be a (3+1)-dimensional membrane embedded in a higher dimensional (9+1)-dimensional fundamental reality. I'll try to explain why these models are considered so... Matt Visser |
19/06/2000 - 14:00
The problem of the 'missing carbonates' on Mars The message we receive from Mars about the presence of carbonates on its surface and in its atmosphere is quite contradictory. On one hand, many images of the Martian surface show clearly the signature of past bodies of standing water, where the precipitation of sedimentary deposits should have occurred. On the other hand, the apparent absence of carbonates in the strikingly homogeneous fines covering the Martian surface raises the question:... Sergio Fonti |
14/06/2000 - 14:00
Ha observations of LSI+61 303. First correlation between compact object and circumstellar disk in the Be/X-ray binaries Remarkable correlation between the Ha emission line and the radio behaviour of LSI+61 303 (GT 0236+610) over its 4 yr modulation is discovered. The radio outburst peak is shifted with 400 d with respect to the Ha equivalent width. The radio outburst onset varies almost in phase with the changes of Ha. A weak moving component in the Ha is detected. We interpret it as due to a denser region, or bulge, orbiting near to the outer edge of the Ha... Radoslav Zamanov |
06/06/2000 - 14:00
Estructura en polarización de los jets relativistas a escalas de parsec En los últimos años, los estudios polarimétricos de la estructura de las radiofuentes compactas con VLBI han experimentado un desarrollo enorme gracias a la existencia de redes interferométricas más homogéneas y mejor calibradas y a la disponibilidad de mejores receptores. En la charla se presentarán resultados recientes sobre la estructura del campo magnético en los jets relativistas a escalas lineales de parsec. Asímismo se mostrarán algunos... Antxon Alberdi |
31/05/2000 - 14:00
Estrellas T Tauri situadas lejos de regiones de formación estelar Observaciones llevadas a cabo en rayos X han puesto de manifiesto la existencia de estrellas jóvenes de baja masa situadas "en los alrededores" de regiones de formación estelar. Dos hipótesis tratan de explicar la distancia de estas estrellas a las regiones mencionadas: formación en nubes pequeñas o ejección de las nubes moleculares grandes. Ambas teorías predicen diferentes distribuciones de periodos de rotación y distintas fracciones... Matilde Fernández |
23/05/2000 - 27/05/2000
Euroconference: The Evolution of Galaxies. I - Observational Clues Euroconference: The Evolution of Galaxies. I - Observational Clues Granada |
18/05/2000 - 14:00
Campañas de Caracterización de la Calidad de Imagen y Meteorología en los Observatorios de Canarias Las prospecciones sistemáticas de sitio están justificadas no sólo por la necesidad de encontrar los mejores enclaves para futuras instalaciones telescópicas, sino también para caracterizar aquellos clasificados como excelentes. Con este propósito, el Grupo de Calidad del Cielo del IAC ha llevado a cabo, desde 1992, diversas campañas en los Observatorios Canarios. El objetivo fundamental de estos muestreos consiste en analizar la meteorología y... Antonia Varela |
08/05/2000 - 14:00
Inversión de la ecuación de transporte radiativo En los últimos años las técnicas de inversión han revolucionado muchas ramas de la Física, en particular de la Astrofísica, por su capacidad para estimar parámetros en modelos complejos que involucran un gran número de grados de libertad. En esta charla expondré brevemente el concepto de inversión y describiré las herramientas matemáticas implementadas en el código SIR (Stokes Inversion based on Response functions). SIR es un código de... Luis Bellot |