Early type stars at large distances from the galactic plane

Details Early type stars at large distances from the galactic plane Early type stars at large distances from the galactic plane

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983iraj...16..131k&link_type=abstract

(Astronomical Science Group of Ireland, Meeting, Armagh, Northern Ireland, May 5, 1983) Irish Astronomical Journal (ISSN 0021-10

Astronomy and Astrophysics

Astronomy

2

Astrometry, Early Stars, Milky Way Galaxy, Chemical Composition, Distance, Stellar Atmospheres, Stellar Evolution, Stellar Mass Ejection

Scientific paper

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).

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