First whole-sky results from the Galactic O-Star Spectroscopic Survey

Maíz Apellániz, J.; Sota, A.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Alfaro, E. J.; Gamen, R. C.; Arias, J. I.; Gallego Calvente, A. T.
Massive Stars: From α to Ω, held 10-14 June 2013 in Rhodes, Greece; Online at, id.198 (2013).


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 March 2013, we have obtained, processed, and classified 2543 spectra of 1521 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 will discuss the fraction of false positives in previous classifications and the implications of the observed spectral type-magnitude-color distribution for the spatial distribution of massive stars and dust within a few kpc of the Sun. We will also present some of the new serendipitous discoveries of peculiar objects allowed by the size and completeness of the sample. Finally, we will also present the new version of the Galactic O-Star Catalog (GOSC), which incorporates the new GOSSS data and that will be made available during the conference.