Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..273c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 273-279.
Astronomy and Astrophysics
Astrophysics
47
B Stars, Early Stars, Galactic Halos, Star Formation, Stellar Atmospheres, Blue Stars, Kinematics, Milky Way Galaxy
Scientific paper
Model atmosphere analyses of seven high-latitude faint blue stars reveal them to be normal Population I objects at typical z-distances of 4 kpc or more. A comparison of the stellar ages with the time that would be required to reach their present locations following ejection from the disk shows that the four objects, PB 5418, TS 195, TS 308, and PHL 2018 could have formed in the disk. The most likely ejection mechanism appears to be close gravitational encounters within stellar clusters, in agreement with previous results (Conlon et al., 1990). The kinematics of the remaining three stars (SB 357, BD - 15 deg 115, and BD - 2 deg 3766) are further investigated, together with those of five high-latitude B-type stars that appear to have formed in the halo, to establish if disk ejection is possible. For three stars (SB 357, PG 0832 + 676, and BD - 15 deg 115), star formation in the halo is the only feasible explanation.
Conlon E. S.
Dufton Philip L.
Holmgren David
Keenan Francis P.
McCausland J. H. R.
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