A new, complete sample of faint B stars in the Galactic halo

Details A new, complete sample of faint B stars in the Galactic halo A new, complete sample of faint B stars in the Galactic halo

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..225m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 295, p. 225

Astronomy and Astrophysics

Astronomy

13

B Stars, Faint Objects, Galactic Halos, Stellar Atmospheres, A Stars, Stellar Spectrophotometry, O Stars, Spectral Resolution, Ultraviolet Astronomy, Balmer Series, Metallicity, Star Distribution

Scientific paper

A new sample of 31 faint B and A0 stars is reported, 30 of which comprise a complete sample within the limits (U-V) less than 0 and B between 10.0 and 18.0. The sample is based on low- and intermediate-resolution spectrophotometry of color-excess objects selected in the U.S. survey. Atmospheric parameters for the stars are derived through the use of synthetic colors, Balmer-line strengths, and model-atmosphere fitting. The atmospheric parameters and preliminary metallicity estimates indicate that most of the stars are distributed along the blue horizontal branch, with low metallicities (Fe/H = 1.0) and with both the first and second Newell gaps present. However, nine of the B/A0 stars can be identified as candidate mainsequence stars, based on evidence of high metallicities (Fe/H = 0) and/or derived effective temperatures and surface gravities which place them close to the main-sequence relation. The completeness characteristics of the sample are discussed, and its surface density is compared to that of other recently isolated B-star samples. The sample exhibits a shallow integral number-count slope. This new sample will help provide increased statistical coverage of the B-star population in the Galactic halo through its relatively faint magnitude-completeness limits and its relatively red color-completeness limit.

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