The possible nature of the high-velocity OB stars - Hot UV-bright stars in the galactic disk
Abstract
It is suggested that many of the high-velocity, low surface gravity, early-type stars are Old Disk Population objects in the same evolutionary phase as the hot UV-bright stars in globular clusters. The bimodal Gaussian fits to the peculiar radial velocity distribution result in Gaussian distribution values of 13 km/s and 28 km/s which are typical of extreme Population I objects and of the Old Disk Population. An analysis of the kinematics of a sample of OB stars indicates solar motion and mean peculiar velocities typical of Population I objects; it is concluded that up to 39 percent of the O-type and 11 percent of the B-type stars may be Old Disk Population objects, referred to as Disk-UV-bright stars.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1980
- Bibcode:
- 1980A&A....92..253C
- Keywords:
-
- B Stars;
- Early Stars;
- O Stars;
- Radial Velocity;
- Stellar Radiation;
- Ultraviolet Radiation;
- Globular Clusters;
- Stellar Evolution;
- Velocity Distribution;
- Astrophysics