Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.290..422r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 290, Issue 3, pp. 422-430.
Astronomy and Astrophysics
Astronomy
19
Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Kinematics
Scientific paper
High-resolution spectroscopy has been obtained for 25 high-latitude stars identified from the Edinburgh-Cape faint blue object survey as having B-type spectra. Five objects are found to be subluminous (subdwarf or horizontal branch), chemically peculiar, or later than B-type. We present model atmosphere analyses for the other 20 objects, and conclude that 17 stars exhibit stellar properties typical of young B-type dwarfs. Photospheric abundances determined for a subset of stars were also found to be consistent with a Population I composition. Furthermore, we believe EC 05229-6058 to be an evolved object currently on the post-asymptotic giant branch phase, whilst EC 20411-2704 and 11074-2912 are consistent with being zero-age horizontal branch and post-blue horizontal branch objects respectively. A kinematic analysis of the normal stars implies that all could have formed in, and have been subsequently ejected from, the Galactic disc.
Dufton Philip L.
Hambly Nigel C.
Keenan Francis P.
Kilkenny Dave
Koen Chris
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