The nature of two blue stars in the galactic halo

Details The nature of two blue stars in the galactic halo The nature of two blue stars in the galactic halo

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269l...1c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

8

Blue Stars, Galactic Halos, Stellar Atmospheres, Stellar Spectra, Asymptotic Giant Branch Stars, Stellar Models, Subdwarf Stars

Scientific paper

We report on the results of model atmosphere analyses of two high galactic latitude blue stars that were previously classified as subdwarfs by Green et al. (1986). One of the objects, PG 1708+142, appears to be the second most distant young B-type star yet studied in the halo, lying at a z-distance of approximately 10 kpc. The various mechanisms responsible for its location so far from the spiral arms, where Population I B-type stars are normally found, are discussed. The second star, PG 1704+222, appears to be evolved, however its atmospheric parameters and chemical composition are compatible with the brief post- asymptotic giant branch evolutionary stage. As such, it is one of a small number of these hot, evolved objects recently discovered at high galactic latitudes.

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