Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417..706h&link_type=abstract
Astrophysical Journal v.417, p.706
Astronomy and Astrophysics
Astronomy
13
Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Evolution
Scientific paper
From the UKST UBVRI survey, six high Galactic latitude stars have been previously identified which may be young hydrogen-burning objects. Using high-dispersion optical spectra, model atmosphere analyses are presented for these targets. Two have normal or nearly normal Population I chemical compositions, one appears to be subluminous while the remaining three are possibly normal late B-type stars. A kinematic analysis indicates that one star having normal parameters is an excellent candidate for formation in the halo, having an evolutionary age an order of magnitude less than the time required for it to attain its current position following ejection from the Galactic disk. A preliminary analysis implies that there may currently be a few thousand normal B-type stars in the Galactic halo with z-distances from the plane of the Galaxy in the range 3 < Ζ < 22 kpc.
Conlon E. S.
Dufton Philip L.
Hambly Nigel C.
Keenan Francis P.
Little J. E.
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