Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-09
Astron.J.131:3047-3068,2006; Erratum-ibid.133:755,2007
Astronomy and Astrophysics
Astrophysics
59 pages including 14 Figures, 12 Tables; Accepted for publication in the Astronomical Journal
Scientific paper
10.1086/504079 10.1086/510486
This paper continues the analysis of faint high latitude B stars from Martin (2004). Here we analyze the kinematics of the stars and combine them with the abundance information from the first paper to classify each one. The sample contains 31 Population I runaways, fifteen old evolved stars (including five BHB stars, three post-HB stars, a pulsating helium dwarf, and six stars of ambiguous classification), one F-dwarf, and two stars which do not easily fit in one of the other categories. No star in the sample unambiguously shows the characteristics of a young massive star formed in situ in the halo. The two unclassified stars are probably extreme Population I runaways. The low binary frequency and rotational velocity distribution of the Population I runaways imply that most were ejected from dense star clusters by DES (dynamic ejection scenario). However we remain puzzled by the lack of runaway Be stars. We also confirm that PB 166 and HIP 41979 are both nearby solar-metallicity BHB stars.
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