The runaway nature of distant early-type stars in the galactic halo

Details The runaway nature of distant early-type stars in the galactic halo The runaway nature of distant early-type stars in the galactic halo

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..357c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 357-361. Research supported by SERC and Canadian In

Astronomy and Astrophysics

Astrophysics

49

B Stars, Binary Stars, Blue Stars, Early Stars, Galactic Structure, Stellar Evolution, Many Body Problem, Mass Transfer, Open Clusters, Reference Stars, Stellar Mass, Supernovae

Scientific paper

The kinematics of a sample of 32 distant halo B-stars with masses in the range 3-21 solar masses are investigated using the current 'runaway star' hypotheses to establish if they belong to this group of stars. Whether postmass transfer secondaries in evolved massive close binaries can be normal low mass B-stars is discussed, but support for this idea is not found. Thus it appears that the lower mass stars could not have been ejected out of the disk as a result of supernova explosions in massive close binaries, while the higher mass objects do not in general reveal a binary nature as expected from this theory. The results of recent N-body simulations of the purely dynamical ejection of runaway stars from young galactic star clusters are in excellent agreement with the observations. Thus it appears that these halo stars are the most distant subgroup of OB runaways produced by cluster ejection yet observed.

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