Seminarios
Seminarios científicos impartidos por científicos y tecnólogos del IAA y de los muchos centros e instituciones de investigación que nos visitan. Muestra del intenso intercambio científico, se celebra a las 12:30 de cada jueves. Los seminarios se retransmiten en directo en IAA - CSIC Seminars Live.
Instrucciones
Para más información contactar con seminars (at) iaa.es.
551 - 600 de un total de 1202
Pages
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29/04/2010 - 14:00
Molecular Gas and Star Formation in Local Early-Type Galaxies The molecular gas content of local early-type galaxies is constrained and discussed in relation to their evolution. First, as part of the Atlas3D survey, we present the first complete, large (>250 objects), volume-limited survey of molecular gas in normal local early-type galaxies, obtained with the IRAM 30m telescope. In particular, we find a surprisingly high detection rate of 23%, independent of mass and environment, but dependent on the... Martin Bureau University of Oxford, UK |
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22/04/2010 - 14:00
Supermassive Black Holes Tbd Dr. Elena dalla Bontá Dipartimento di Astronomia Universitá di Padova (Italia) |
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15/04/2010 - 14:00
ALMA/CASA: You better get ready for them! ALMA is going to start its Early Science Observations during 2011 and a Call for Early Science with its compact array will be issued at the end of this year. At the same time, CASA, the software that ALMA users will have at their disposal, is being continuously developed. I will present an overview of a couple of workshops I attended in Manchester related to ALMA and CASA, which hopefully will encourage you to think for proposals with ALMA and... Miguel Ángel Pérez Torres Instituto de Astrofísica de Andalucía - CSIC |
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18/03/2010 - 13:00
Unfolding Properties of Mass Loss at the Tip of the Asymptotic Giant Branch In the final stages of stellar evolution low- to intermediate-mass stars lose their envelope in increasingly massive stellar winds. Matter, which has been processed inside these stars, is thereby returned to the interstellar medium, and mass loss also determines properties of subsequent planetary nebulae. In order to obtain properties of winds at the tip of the asymptotic giant branch we observed weak halos of a set of planetary nebulae in the... Christer Sandin Astrophysikalisches Institut Potsdam (AIP) |
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16/03/2010 - 13:00
OCTOCAM: A fast multichannel camera and spectrograph for the 10.4m GTC OCTOCAM is a high time-resolution multi-channel instrument that is being proposed for the 10.4m GTC telescope. It will perform simultaneous observations in 8 bands, covering the complete spectrum from the ultraviolet (u-band) to the near infrared (K-band) in a single exposure. An imaging mode will allow to observe a field of 2'x2' in all ugrizJHK bands, with the possibility to observe at time resolutions of up to 10 ms, while the spectroscopic... Antonio de Ugarte Postigo Instituto de Astrofísica de Andalucía - CSIC |
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11/03/2010 - 13:00
Size matters This is a talk I gave last October in Freiburg as the opening key-note lecture of the "1st EAST-ATST Workshop". The American ATST (Advanced Technology Solar Telescope) and the European EST (European Solar Telescope) are projects for designing and building the new generation of large-aperture, solar telescopes. Both of the 4-m class constitute a technological breakthrough and promise a significant step forward in our understanding of... José Carlos del Toro Iniesta Instituto de Astrofísica de Andalucía - CSIC |
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04/03/2010 - 13:00
Structure and kinematics of the Milky Way's nuclear star cluster The Galactic center is a unique target for studying the properties of the nuclei of galaxies in general. The supermassive black hole, Sagittarius A*, that is located at the dynamical center of the Milky Way is surrounded by the densest and most massive star cluster of our Galaxy. In this talk I will focus on the most recent results of research on the structure and kinematics of the Milky Way's nuclear star cluster. Adaptive optics imaging is a... Rainer Schoedel Instituto de Astrofísica de Andalucía - CSIC |
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25/02/2010 - 13:00
Testing spectral models for Stellar Populations High spectral resolution evolutionary synthesis models have become a routinely used ingredient in extragalactic work, and as such deserve thorough testing. Star clusters are ideal laboratories for such tests. In this talk I apply the spectral fitting methodology to a sample of clusters, mainly from the Magellanic Clouds and spanning a wide range in age and metallicity, fitting their integrated light spectra with a suite of modern evolutionary... Rosa González Delgado Instituto de Astrofísica de Andalucía - CSIC |
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19/02/2010 - 18:00
Pulsating stars harbouring planets In this talk, I present a review of the current status of the very recent line of research linking stellar seismology and exoplanet search. I give a summary of the main exoplanet searching techniques and a general overview of stellar seismology. Some examples of the synergies between these two lines will also be given. If a star harbouring planets is found to be pulsating, our knowledge of the physical characteristics of these planets is... Andrés Moya Bedón CAB - CSIC |
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16/02/2010 - 12:00
Extragalactic research with the Virtual Observatory Nowadays, following years of technological development, Virtual Observatory standards, resources, and services became powerful enough to help astronomers making real science on everyday basis. An astronomer is able to combine ``online'' VO-enabled parts with ``offline'' research stages including dedicated data processing and analysis, observations, numerical simulations. I will present three VO-science projects combining VO and non-VO blocks,... Igor Chilingarian Observatoire de Strasbourg, France |
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11/02/2010 - 13:00
Observational constrains to galaxy evolution from the distribution of integrated stellar ages and metallicities in spiral galaxies I will present new results on the integrated stellar populations of bulges, bars and disks of spiral galaxies from long-slit spectroscopic observations. We have derived the ages and metallicities using both the whole spectra and stellar line-strength indices along the bar and bulges for a sample of 20 disk galaxies and derived the populations in the disks of four galaxies using GEMINI spectroscopic data. We find, in the distribution of stellar... Isabel Pérez Martín Universidad de Granada |
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04/02/2010 - 13:00
First results of the Fermi Large Area Telescope The Fermi Large Area Telescope (Fermi LAT) is a pair conversion telescope sensitive to photons in the energy range 30 MeV to >300 GeV. It was launched on June 11th 2008 and has now been successfully operating for over a year and made breakthrough discoveries in high energy astrophysics. In this seminar I will give an overview of the results from Fermi LAT and the implication it has had in astrophysics and astro-particle physics. Gudlaugur Johannesson SLAC, Standford, USA |
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28/01/2010 - 13:00
The Galactic O-Star Spectral Survey (GOSSS) I present a large-scale spectral survey that is currently obtaining spectra of all known Galactic O stars down to B=13 with R=3000. The project includes additional observations of subsamples with [a] multi-epoch spectroscopy with R=40000, [b] flux-calibrated optical spectroscopy, and [c] high-spatial-resolution imaging. The main part of GOSSS is based on data from OSN, CAHA, and LCO. I will describe the current status of the survey and present... Jesús Maíz Apellániz Instituto de Astrofísica de Andalucía - CSIC |
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21/01/2010 - 13:00
The First 3mm Polarimetric Survey of Radio Loud AGN Relativistic jets in AGN are the most energetic and among the most powerful astrophysical objects known so far. Their relativistic nature provides them the ability to emit profusely in all spectral ranges from radio wavelengths to TeV gamma-rays, as well as abrupt variability in all time scales (from hours to years). After an extended review of the present knowledge of these objects, but paying particular attention to blazars, the main results... Iván Agudo Rodríguez Instituto de Astrofisica de Andalucía - CSIC |
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14/01/2010 - 13:00
Radio Supernovae: A Window into the Heart of Starburst Galaxies High-resolution radio observations of the nuclear regions of Luminous and Ultraluminous Infrared Galaxies (ULIRGs) have shown that their radio structure consists of a compact high surface-brightness central radio source inmersed in a diffuse low brightness circumnuclear halo. While the central components could be associated with AGNs or compact star-forming regions, where radio supernovae are exploding, it is well known that the circumnuclear... Antxón Alberdi Instituto de Astrofísica de Andalucía - CSIC |
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10/12/2009 - 13:00
eXtreme Multiplex Spectrograph for the 3.5m Calar Alto telescope We'll describe the design and science case for the XMS spectrograph at the prime focus of the 3.5-m Calar Alto telescope that can deliver at least 4000 MOS slits simultaneously over a 1-deg field. This extreme multiplex capability means that 25000 galaxy redshifts can be measured in a single night, opening up the possibilities for large galaxy redshift surveys out to z~1 to study galaxy evolution by estimating galaxy group and cluster masses,... Francisco Prada & Santiago Becerril Instituto de Astrofisica de Andalucia - CSIC |
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03/12/2009 - 13:00
Tracing dust at the edge of destruction: NIR observations of YSO transitional disks and nearby AGN with the Keck interferometer After a short introduction to modern infrared long baseline interferometry, I will present the results of two actual projects of mine, dealing with dust around stars and AGN. Based on observations with the Keck interferometer, we could show that the infrared-excess in transitional YSO class II disks typically derives from circumstellar disk material, and not from a close companion star. Disk dissipation induced by planet formation now appears to... Jörg-Uwe Pott Max-Planck-Institute for Astronomy, Heidelberg |
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26/11/2009 - 13:00
GROND: A multi-channel imager on La Silla GROND stands for Gamma-Ray Burst Optical/Near-Infrared Detector. It is a 7-channel imager developed by the Max-Planck-Institut for extraterrestrial Physics in Garching, Germany, with contributions from the Thueringer Landessternwarte Tautenburg, Germany. GROND is mounted at the 2.2m telescope on La Silla since mid 2007. A short overview is given about the instrument, its operation, and its scientific achievements. Sylvio Klose Thueringer Landessternwarte Tautenburg (Germany) |
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19/11/2009 - 13:00
CARMENES, a next-generation instrument for the CAHA 3.5-m telescope CARMENES is a study for a next-generation instrument for the 3.5m telescope at the Calar Alto Observatory that will be built by an international consortium. CARMENES stands for Calar Alto high-Resolution search for M dwarfs with Exo-Earths with a Near-infrared Echelle Spectrograph. Since M dwarfs have low effective temperatures (Teff < 4000 K), our spectrograph is designed to operate in the optical red and the near infrared, where they emit... Pedro J. Amado Instituto de Astrofísica de Andalucía - CSIC |
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12/11/2009 - 13:00
An extremely prolific supernova factory in the buried nucleus of a starburst galaxy Tbd Miguel Ángel Pérez Torres Instituto de Astrofísica de Andalucía - CSIC |
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05/11/2009 - 13:00
ESO: a brief overview Based on talks presented at the "Jornada ESO 2009", held on 22 September 2009, I will provide a brief overview of some statistical data related to ESO and particularly the role of Spain within ESO. I will also provide a brief overview of the current status of ESO telescopes and available instruments as well as upcoming developments, like ALMA/E-ELT. Rainer Schoedel Instituto de Astrofísica de Andalucía - CSIC |
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29/10/2009 - 13:00
PANIC: current status We will present the current status of the PANIC project. This instrument will be the first to be built inside the Spanish-German consortium signed between MPIA and IAA for the development of new instrumentation for the Calar Alto Observatory. PANIC is a wide-field infrared imager for the Ritchey-Chrétien focus of the Calar Alto 2.2m and 3.5m telescopes. The camera optical design is a folded single optical train that images the sky onto the focal... Matilde Fernández, Julio F. Rodríguez, Conchi Cárdenas y José M. Ibáñez Instituto de Astrofísica de Andalucía - CSIC |
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22/10/2009 - 14:00
Light Scattering in the Solar System A concise survey of light scattering by small dust particles in the atmospheres and surface layers of various Solar System bodies, comets, the interplanetary medium, and in planetary rings is presented. Current issues and recent developments are emphasized. Special attention is given to experimental and numerical approaches for solving problems of light scattering by non-spherical dust particles. Key areas for further research are pointed out... Prof. J.W. Hovenier University of Amsterdam |
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15/10/2009 - 14:00
Las variables luminosas azules de la Gran Nube de Magallanes en acción: La evolución estelar masiva en tiempo real Las dos estrellas mas brillantes de la LMC en este momento son dos VLA en estado de erupción. Radcliffe 127 (R127) había sido una estrella de tipo Ofpe antes de 1980. En 1982 se descubrió que estaba entrando en una erupción de VLA, enseñándonos por primera vez la relación entre esos dos tipos de objetos peculiares. Estos eventos consisten en una expansión de la estrella y/o un eyección de una capa que reprocesa la luz ultravioleta hacia el rango... Nolan Walborn Space Telescope Science Institute |
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24/09/2009 - 14:00
he central parsec of the Milky Way: shocks, outflows and young stars Both a dense stellar cluster and streamers of gas and dust coexist within the central parsec of the Milky Way Galaxy, in the deep potential well of the 4 million MSun black hole at the position of the radio source SgrA*. A number of features in the local interstellar medium (ISM) reveal that there is a great deal of interaction going on at the Galactic Center (GC), building up evidence for the existence of outflow(s) in the central 0.5 pc. The... Koraljka Muzic University of Cologne |
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17/09/2009 - 14:00
Oscurecimiento en LINERs Tbd. Josefa Masegosa Gallego Instituto de Astrofísica de Andalucía - CSIC |
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10/09/2009 - 14:00
8 meses del Año Internacional de la Astronomía 145 países participantes. En España, más de 2000 actividades ya celebradas y más de 1000 entidades participantes. Tras ocho meses de celebración, y gracias a la implicación de miles de personas, el Año Internacional de la Astronomía ha dado lugar a la mayor red de divulgación científica que ha existido nunca. Hablaré de la evolución que ha seguido esta conmemoración durante este periodo, las principales iniciativas que se han impulsado a nivel... Montserrat Villar Martín Instituto de Astrofísica de Andalucía - CSIC |
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02/07/2009 - 14:00
Sunrise: una revisión previa a la ciencia En esta charla pretendo dar una visión global de la misión Sunrise, de sus propósitos científicos y de su desarrollo tecnológico. En particular me centraré en IMaX, el magnetógrafo solar en el cual ha participado con éxito el IAA (CSIC), tanto en su definición científica como siendo responsable de toda la electrónica y software del instrumento. Describiré aspectos del diseño y fabricación, así como presentaré abundante material gráfico de la... José Carlos del Toro Iniesta Instituto de Astrofísica de Andalucía - CSIC |
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25/06/2009 - 14:00
Asteroids as the parent bodies of meteorites: compositional differences and size-dependent transport mechanisms Asteroids that come close to the Earth´s orbit (near-Earth asteroids, or NEAs) are targets of different sample-return space missions, providing us with material from their surfaces. Besides, we can also analyze the composition of meteorites in the laboratory, and run dynamical models that give us information about the source regions of NEAs and, consequently, the meteorites. By means of mineralogical analysis of their reflectance spectra,... Julia de León Cruz Instituto de Astrofísica de Andalucía - CSIC |
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18/06/2009 - 14:00
25/20: The 25 greatest discoveries in astronomy and astrophysics of the 20th century I will present my personal list of the 25 most important and influential discoveries in astronomy of the 20th century. I will analyse the papers that reported these discoveries by the year they occurred, the age of the discoverers and the country where the people worked. The decades 1911-20 and 1960s were the most productive of the 20th century, in spite of the arrival of computers and observatories in space. I suggest reasons for the decline in... Prof. John Hearnshaw University of Canterbury (New Zealand) |
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21/05/2009 - 14:00
Comparing High and Low Redshift Quasar Properties: Black Hole Masses and Eddington Ratios Black hole mass and Eddington ratio estimates for quasars are of fundamental interest to astrophysicists and cosmologists. Comparisons of high and low redshift quasar properties are of special interest. Past comparisons have been unreliable because estimates are based upon measures of different emission lines in different redshift ranges. Are all broad emission lines valid virial estimators? Evidence suggests not motivating us to follow Hbeta... Jack Sulentic University of Alabama / Instituto de Astrofísica de Andalucía - CSIC |
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30/04/2009 - 14:00
PINGS: the PPAK IFS Nearby Galaxies Survey I will present the PPAK Integral Field Spectroscopy (IFS) Nearby Galaxies Survey: PINGS, a 2-dimensional spectroscopic mosaicking of 17 nearby disk galaxies in the optical wavelength range. This project represents the first attempt to obtain continuous coverage spectra of the whole surface of a galaxy in the nearby universe. The final data set comprises more than 44000 individual spectra, covering an observed area of nearly 80 arcmin squared.... F. Rosales-Ortega IoA, Cambridge |
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23/04/2009 - 14:00
CdC-SF: A precise proper motion catalogue from 'Carte du Ciel' plates, San Fernando Zone I will present an astrometric catalogue of positions and proper motions derived from the "Carte du Ciel" plates, San Fernando zone, which has a mean epoch 1901.4 and a limiting magnitude V~15. Digitization has been made using a conventional flatbed scanner. Special techniques have been developed to handle the combination of plate material and the large distortion introduced by the scanner. A variety of post-scan corrections are shown... Belén Vicente Instituto de Astrofísica de Andalucía - CSIC |
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16/04/2009 - 14:00
Can we find Earth-mass planets orbiting our nearest star, alpha centauri? I will describe a new program at Mt John that aims to find Earth-mass planets orbiting either alpha Cen A or B, which are solar type stars in a well known binary. We are measuring precise radial velocities using the Hercules spectrograph, which I will describe. At least 10000 spectra at S/N ~ 500:1 giving 1 m/s precision will be needed. Theoretical studies show that Earth mass planets can have stable orbits to 3 AU and that such planets will... Prof. John B. Hearnshaw Univ. of Canterbury, New Zealand |
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31/03/2009 - 14:00
Extended Emission Line Regions around radio-quiet QSOs It was noted soon after the discovery of the first quasars that some of them were surrounded by a nebulosity. Narrow-band imaging surveys and spectroscopic studies of quasars by Stockton et al. and Boroson et al. in the 1980s revealed that these nebulosities originated from extended emission-line regions (EELRs) where gaseous material is kept photoionized by the quasar. Since most of these quasars are radio-loud ones, it has been thought that... Bernd Husemann AIP, Potsdam |
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26/03/2009 - 13:00
Misión espacial Kepler. Planetas y Estrellas: Oferta 2x1 En los últimos años se han lanzado dos misiones espaciales CoRoT (CNES, ESA) y Kepler (NASA) que presentan objetivos científicos. Por un lado, buscar exoplanetas, i.e. planetas fuera del Sistema Solar, aquellos que se encuentran en la zona habitable (planetas en lo que pueda haber agua en estado líquido). Y por otro lado, observar estrellas para estudiar su estructura interna y evolución, haciendo uso de la Astrosismología. En esta charla... Juan Carlos Suárez Instituto de Astrofísica de Andalucía - CSIC |
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19/03/2009 - 13:00
Spacetime and Noncommutative Geometry This talk, which is intended for non-specialists and makes particular emphasis on astrophysical/cosmological implications, will review the underlying physical motivations for the suggestions that spacetime is noncommutative. Causality violations are implied by such noncommutativity and that leads to physical effects. It also leads to Pauli principle violations and forbidden transitions, and to observable effects in CMB temperature spectrum.... A. P. Balachandran Syracuse University |
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12/03/2009 - 13:00
El Universo visto por las Astrónomas La Astronomía moderna no se puede concebir sin el trabajo realizado por todas aquellas mujeres que con su dedicación y amor a la ciencia nos han dejado su legado. A pesar de la práctica inexistencia de documentación bien estructurada sobre su papel en la historia de la Astronomía, los datos existentes muestran que ha existido un buen número de mujeres que con sus trabajo de investigación han contribuido a la concepción que hoy tenemos del... Josefa Masegosa Gallego Instituto de Astrofísica de Andalucía - CSIC |
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11/03/2009 - 13:00
SpIOMM: An imaging Fourier transform spectrometer in the visible for astronomical observations Attached to the 1.6-meter telescope of the Observatoire du Mont Mégantic in southern Québec, SpIOMM is an imaging Fourier transform spectrometer designed to obtain the visible range (350 – 850 nm) spectrum of every astronomical light source in a circular field of view of 12 arcminutes in diameter. I will present some results of four recent successful observing runs, which highlight SpIOMM’s capabilities to map emission line objects... Gaetan Perron ABB, Canadá |
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26/02/2009 - 13:00
Very High Energy Gamma-Ray Astrophysics with MAGIC The MAGIC-I telescope is currently the largest single-dish Imaging Atmospheric Cherenkov telescope in the world. A second telescope, MAGIC-II, will upgrade MAGIC-I in sensitivity, angular and spectral resolution from this year on. I shall describe the Cherenkov telescope detection technique, the astrophysical topics of interest in this brand new astronomical window and the results of the last four years of observation with the MAGIC telescope... Juan Cortina Instituto de Física de Altas Energías (IFAE), Bellaterra |
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19/02/2009 - 13:00
Panchromatic analysis of the star formation processes in M33 The spiral galaxy M33 belongs to the local group and allows us to study star formation processes with great accuracy. The Spitzer telescope reaches spatial resolutions of the order of some parsecs and reveals the interactions between young stars and the interstellar medium. A detail analysis focussed on the typical colours of discrete sources such as HII regions, planetary nebulae and supernovae remnants. Also, we estimated the star formation... Simon Verley UNAM, México |
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29/01/2009 - 13:00
Charlas DEA / TIT En el camino hacia ALMA: técnicas de calibración de fase y gas molecular en grupos compactos de galaxias Vicent Martínez i Badenes (IAA-CSIC) En esta charla presentaré la preparación que llevo a cabo desde un punto de vista tanto científico como técnico de cara a ALMA. Las turbulencias en el vapor de agua en la troposfera producen decorrelación en la señal en los interferómetros milimétricos/submilimétricos. Aun habiendo varias técnicas de... Vicent Martínez y Walter Savolo Instituto de Astrofísica de Andalucía - CSIC |
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22/01/2009 - 13:00
What can we learn from synthetic emission maps for the jet of M87? We present a self-consistent MHD model for the jet of M87. The model consist of two distinct zones: an inner relativistic outflow and an outer cold disk-wind. While the former does not self-collimate efficiently due to its high effective inertia, the latter fulfils all the conditions for efficient collimation by the magneto-centrifugal mechanism. The relativistic flow is thus magnetically confined into a well collimated beam for a wide range of... José Gracia Dublin Institute for Advanced Physics (Irlanda) |
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15/01/2009 - 13:00
The retired galaxies Tbd. Roberto Cid Fernandes Universidad Federal de Santa Catarina (Brasil) |
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08/01/2009 - 13:00
Modelisation of the variability of TeV blazars with a stratified jet model We present a new time-dependent inhomogeneous jet model of non-thermal blazar emission, which reproduces the entire spectral energy distribution together with the rapid gamma-ray variability. Ultra-relativistic leptons are injected at the base of a jet and propagate along the jet structure. We assume continuous reacceleration and cooling, producing a relativistic quasi-maxwellian (or "pile-up") particle energy distribution. The... Timothe Boutelier Laboratoire d'Astrophysique de l'Observatoire de Grenoble (LAOG) |
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18/12/2008 - 13:00
Las edades relativas de los cúmulos globulares: consecuencias sobre la escala temporal de la formación de la Vía Láctea Nuestro grupo ha utilizado 130 órbitas del HST/ACS para obtener diagramas color-magnitud profundos de 65 cúmulos globulares de la Vía Láctea ("Treasury Project on Galactic Globular Clusters"). Estos datos nos han permitido obtener las edades relativas de estos objetos con una precisión superior a la que disponíamos hasta ahora y deducir información relevante sobre el proceso de formación de la Vía Láctea y la escala temporal en que se... Antonio Aparicio Instituto de Astrofísica de Canarias (IAC) |
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11/12/2008 - 13:00
The interplay of gas and stars in nearby galaxies To understand the evolution and appearance of galaxies it is crucial to study the interplay between stars and the interstellar gas and dust. I will present results and plans to study the ISM and star formation in the nearby galaxies M51 and M33. For M51, we combined maps of the molecular and atomic gas to derive the total gas surface density. Taking into account the velocity dispersions of the molecular and atomic gas, and the stellar surface... Carsten Kramer Instituto de Radioastronomía Milimétrica (IRAM) |
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04/12/2008 - 13:00
Fulguraciones en una nueva fuente galáctica: ¿el eslabón perdido entre los magnetares y las estrellas de neutrones aisladas? Las apariencias engañan. El 10 de junio de 2007 el satélite SWIFT descubrió lo que aparentemente era otro estallido de rayos gamma en la dirección de la Via Láctea. El comportamiento observado horas después apuntaba a una naturaleza bien distinta, observándose 40 fulguraciones ópticas durante los tres días siguientes antes de desaparecer. Observaciones multirrango realizadas durante meses han confirmado su origen en nuestra Galaxia, siendo... Alberto Castro Tirado Instituto de Astrofísica de Andalucía - CSIC |
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27/11/2008 - 13:00
Simulating Reionization: Yesterday, Today, and Tomorrow Cosmic reionization - the process of ionization of the bulk of cosmic gas by ultra-violet radiation from primeval galaxies - is by far the most dramatic event that occurred in the universe since the formation of the first star. I will give a very personal and highly biased view on the recent progress in modeling reionization with numerical simulations, and will discuss a possible avenue for catching the next big prize in numerical cosmology.... Nick Gnedin Fermilab & The University of Chicago |
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20/11/2008 - 13:00
Physical parameters of T dwarfs derived from high-resolution near-infrared spectroscopy I present a study aimed at determining the effective temperature and surface gravity of a sample of nine T-type field T dwarfs from the comparison of high-resolution near-infrared spectra and synthetic models. The spectra were obtained with NIRSPEC, using ten echelle orders to cover part of the J-band with a resolving power R~20,000. The AMES-COND cloudless solar metallicity models used here were obtained using the PHOENIX code. The modelled... Carlos del Burgo Dublin Institute for Advanced Physics (Dublin, Ireland) |