Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989iraj...19...59c&link_type=abstract
(Astronomical Science Group of Ireland, Meeting, Dundalk Regional College, Republic of Ireland, Mar. 23, 1989) Irish Astronomica
Physics
2
Blue Stars, Early Stars, Stellar Physics, Stellar Spectra, Subdwarf Stars, Spectrum Analysis, Stellar Atmospheres, Stellar Models
Scientific paper
High resolution optical spectra of fifteen intermediate and high latitude blue stars have been obtained using the 2.5 m Isaac Newton and the 3.9 m Anglo-Australian Telescopes. Three of the sample are identified as subdwarfs. The remaining twelve are analyzed for atmospheric parameters and metal and helium abundances using model atmosphere techniques, and appear to be normal B-type stars 1 kpc or more from the plane. Their origin is discussed in terms of their available kinematics. Eight of the stars could have been formed in the galactic plane and reached their present z-positions in their lifetimes. From the stellar kinematics, cluster ejection seems the most likely mechanism for their presence in the halo, although close binary ejection may have been responsible for a small number of these stars. Four stars could not have traveled from the disk to their current halo z-distances in their lifetimes, and the idea of star formation in the halo is briefly discussed.
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