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 its first results. The immediate goal of GOSSS is to create the largest possible spectral database for visually observable Galactic O stars using high-quality, high-S/N, uniform data. The intermediate goals are the reanalysis of the fundamental spectral morphology for O stars, the identification of massive multiple systems and the measurement of their masses, and the obtention of the extinction for the stars in the sample. The ultimate goals are the analysis of the multiplicity for massive stars, the derivation of the massive star IMF in the solar neighborhood for both the field and some clusters, the obtention of a new Galactic extinction law, and the study of the spatial distribution of massive stars and dust within 3 kpc of the Sun. Such an ambitious program is the first part of a global program that will be extended beyond 2013 with data from facilities such as Gaia and LAMOST.

 

Fecha: 
28/01/2010 - 13:00
Conferenciante: 
Jesús Maíz Apellániz
Filiación: 
Instituto de Astrofísica de Andalucía - CSIC


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