Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324..747m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 3, pp. 747-756.
Astronomy and Astrophysics
Astronomy
13
Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Kinematics
Scientific paper
We present high-resolution spectroscopic observations of 21 B-type stars, selected from the Edinburgh-Cape Blue Object Survey. Model atmosphere analyses confirm that 14 of these stars are young, main-sequence B-type objects with Population I chemical compositions. The remaining seven are found to be evolved objects, including subdwarfs, horizontal branch and post-AGB objects. A kinematical analysis shows that all 14 young main-sequence stars could have formed in the disc and subsequently been ejected into the halo. These results are combined with the analysis of a previous subsample of stars taken from the Survey. Of the complete sample, 31 have been found to be young, main-sequence objects, with formation in the disc, and subsequent ejection into the halo, again being found to be a plausible scenario.
Dufton Philip L.
Keenan Francis P.
Kilkenny Dave
Koen Chris
Magee R. M. H.
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