Tr. Kendall et al., ULTRAVIOLET FE-III LINES IN THE SPECTRA OF HIGH GALACTIC LATITUDE EARLY-TYPE STARS, Astronomy and astrophysics, 290(2), 1994, pp. 563-572
Using high resolution spectral data from the International Ultraviolet
Explorer satellite, we present qualitative and quantitative compariso
ns of blends of Fe III absorption lines in the region 1890 Angstrom le
ss than or equal to lambda less than or equal to 1930 Angstrom for a s
ample of fifteen high latitude B-type and standard stars. Standard and
halo stars were matched in effective temperature and surface gravity
using Stromgren [c(1)] and H beta photometry, and LTE model atmosphere
codes were used to investigate whether they had similar iron abundanc
es. We conclude that while most of the halo stars have Population I ir
on abundances and may be young objects, one star, HD 177566, has signi
ficant iron and silicon depletions and is most probably an old, evolve
d star. In view of the coincidence of the atmospheric parameters of th
is star with those of young B-type stars, we consider a post-AGB evolu
tionary status to be likely for HD 177566.