The Galactic O-Star Spectroscopic Catalog (GOSC) and Survey (GOSSS): first whole-sky results and further updates

J. Maíz Apellániz (1), A. Sota (1), N. I. Morrell (2), R. H. Barbá (3), N. R. Walborn (4), E. J. Alfaro (1), R. C. Gamen (5), J. I. Arias (3), and A. T. Gallego Calvente (1)

(1) Instituto de Astrofísica de Andalucía-CSIC, Granada, Spain; (2) Las Campanas Observatory, La Serena, Chile; (3) Departamento de Física, Universidad de La Serena, La Serena, Chile; (4) Space Telescope Science Institute, Baltimore, MD, USA; (5) Instituto de Astrofísica de La Plata (CONICET, UNLP), La Plata, Argentina

The Galactic O-Star Spectroscopic Survey (GOSSS) is obtaining high quality R~2500 blue-violet spectroscopy of all Galactic stars ever classified as of O type with B < 12 and a significant fraction of those with B = 12-14. As of June 2013, we have obtained, processed, and classified 2653 spectra of 1593 stars, including all of the sample with B < 8 and most of the sample with B = 8-10, making GOSSS already the largest collection of high quality O-star optical spectra ever assembled by a factor of 3. We discuss the fraction of false positives (stars classified as O in previous works that do not belong to that class) and the implications of the observed magnitude distribution for the spatial distribution of massive stars and dust within a few kpc of the Sun. We also present new spectrograms for some of the interesting objects in the sample and show applications of GOSSS data to the study of the intervening ISM. Finally, we present the new version of the Galactic O-Star Catalog (GOSC), which incorporates the data in GOSSS-DR1, and we discuss our plans for MGB, an interactive spectral classification tool for OB stars.

Reference: 13 pages, 9 figures. To appear in "Massive Stars: From alpha to Omega", a meeting held in Rhodes, Greece, on 10-14 June 2013.
Status: Conference proceedings