Early-type Stars at Large Distances from the Galactic Plane
Abstract
Tobin and Kaufmann (1984) have shown that three early-type halo stars are normal, distant objects, and there appears to be increasing evidence to support the large distances derived for these stars. The present investigatiton is concerned with research which provides some insight into the nature and possible origin of these objects. The nature of the early-type stars in the Galactic halo is discussed, taking into account atmospheric parameters and chemical compositions, and distances and ejection velocities. In connection with a consideration of the origin of the early-type halo stars, it is pointed out that some mechanism has to be invoked to accelerate stars to large velocities in order to explain their presence in the halo. Attention is given to the 'runaway' hypothesis considered by Zwicky (1957).
- Publication:
-
Irish Astronomical Journal
- Pub Date:
- September 1983
- Bibcode:
- 1983IrAJ...16..131K
- Keywords:
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- Astrometry;
- Early Stars;
- Milky Way Galaxy;
- Chemical Composition;
- Distance;
- Stellar Atmospheres;
- Stellar Evolution;
- Stellar Mass Ejection;
- Astrophysics