Abundance analyses of a sample of five faint blue stars in the galactic halo.

Details Abundance analyses of a sample of five faint blue stars in the galactic halo. Abundance analyses of a sample of five faint blue stars in the galactic halo.

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317...82k&link_type=abstract

Astronomy and Astrophysics, v.317, p.82-89

Astronomy and Astrophysics

Astrophysics

3

Stars: Early-Type, Stars: Post-Asymptotic Giant Branch, Stars: Abundances, Galaxy: Halo

Scientific paper

High resolution optical spectra of five faint high galactic latitude B-type stars, identified from a magnitude limited survey, have been analysed using LTE model atmosphere calculations. All targets have small projected rotational velocities (<=30km/s) and hence may be evolved objects. This is supported by their chemical compositions, which indicate that they are old Population II stars; two stars also show enhanced nitrogen abundances probably due to the mixing of nuclear processed material to their surfaces. Their atmospheric parameters are consistent with a post-Asymptotic Giant Branch evolutionary status, although two targets may have evolved directly off the horizontal branch.

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