Gaia-ESO Survey: massive stars in the Carina Nebula. A new census of OB stars

Autor(en)

S. R. Berlanas, J. Maíz Apellániz, A. Herrero, L. Mahy, R. Blomme, I. Negueruela, R. Dorda, F. Comerón, E. Gosset, M. Pantaleoni González, J. A. Molina Lera, A. Sota, T. Furst, E. J. Alfaro, M. Bergemann, G. Carraro, J. E. Drew, L. Morbidelli, J. S. Vink

Abstrakt

The Gaia-ESO survey sample of massive OB stars in the Carina Nebula consists of 234 stars. The addition of brighter sources from the Galactic O-Star Spectroscopic Survey and additional sources from the literature allows us to create the most complete census of massive OB stars done so far in the region. It contains a total of 316 stars, being 18 of them in the background and four in the foreground. Of the 294 stellar systems in Car OB1, 74 are of O type, 214 are of non-supergiant B type and 6 are of WR or non-O supergiant (II to Ia) spectral class. We identify 20 spectroscopic binary systems with an O-star primary, of which 6 are reported for the first time, and another 18 with a B-star primary, of which 13 are new detections. The average observed double-lined binary fraction of O-type stars in the surveyed region is 0.35, which represents a lower limit. We find a good correlation between the spectroscopic n-qualifier and the projected rotational velocity of the stars. The fraction of candidate runaways among the stars with and without the n-qualifier is 4.4% and 2.4%, respectively, although non resolved double-lined binaries can be contaminating the fast rotators sample.

Organisation(en)

Institut für Astrophysik

Journal

Astronomy & Astrophysics

Band

671

ISSN

0004-6361

Publikationsdatum

01-2023

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/c0e9c295-7123-4b21-b08f-f7bf1ebc252c