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1999AJ....117.2329W - Astron. J., 117, 2329-2380 (1999/May-0)
Spectroscopy of hot stars in the galactic halo. III. Analysis of a large sample of field horizontal-branch and other A-type stars.
WILHELM R., BEERS T.C., SOMMER-LARSEN J., PIER J.R., LAYDEN A.C., FLYNN C., ROSSI S. and CHRISTENSEN P.R.
Abstract (from CDS):
Included in the hot star sample are 444 stars we classify as field horizontal-branch stars, 416 we classify as main-sequence-gravity A-type (or slightly later) stars (including stars that are likely members of the blue metal-poor population, the so-called BMPs), 140 stars we classify as likely metallic-line (Am) or peculiar (Ap) stars, and 121 stars that cannot be unambiguously classified based on the present data. Examination of the distributions in metallicity and velocity indicates that the field horizontal-branch and main-sequence A-type samples are quite distinct; hence we expect only a modest amount of cross-contamination between the subsamples.
We identify 58 RR Lyrae candidates among the hot star sample, based on incompatibilities in their photometric and spectroscopic data. There are 19 stars in the sample that have been previously classified as RR Lyrae variables, and one additional star that had been previously suggested as a variable, though not necessarily of the RR Lyrae class. There are 115 stars in the sample that were previously classified as BMPs by Preston, Beers, & Shectman, most of which fall into the main-sequence A-type category, but 10 of which are found among the Am/Ap classifications. Furthermore, 53 of stars previously considered to be BMPs are shown by our analysis to have metal abundances [Fe/H]>-1, which calls their identification with this population somewhat into question.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Halo - Stars: Horizontal-Branch - Stars: Population II
VizieR on-line data: <Available at CDS (J/AJ/117/2329): tables 1, 2, 3, A1, B1>
Nomenclature: Table 1: BPS BS FFFFF-NNN N=90, BPS CS FFFFF-NNN N=1031.
Simbad objects: 1125
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