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A New Sample of Faint Halo B Stars

Published online by Cambridge University Press:  07 August 2017

Kenneth J. Mitchell ,
Rex A. Saffer  and
Steve B. Howell
Kenneth J. Mitchell
Affiliation:
General Sciences Corporation, 6100 Chevey Chase Dr., Laurel, MD 20707
Rex A. Saffer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218
Steve B. Howell
Affiliation:
Planetary Science Institute, 2421 E. 6th St., Tucson, AZ 85719

Abstract

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This poster reports the isolation of a new, complete sample of 24 faint halo B stars. These B stars were selected as blue- and ultraviolet-excess objects in the US survey at high Galactic latitudes (Usher and Mitchell 1990), and were given preliminary classifications using low-resolution spectrophotometry. The new sample is complete over 206 square degrees of sky to faint magnitude completeness limits in the range B = 16.5 and B = 18.3.

Stromgren color indices for the US B stars have been derived from the spectrophotometry through numerically convolved filters (Howell 1986). The colors have been used to help define the red completeness limit of the sample at (b – y) = −0.01, at the B9.5/A0 classification boundary. In addition, surface gravity and temperature estimates useful for separating the hotter B stars from sdB stars have been provided by atmospheric model fitting to the existing spectra (cf. Saffer et al. 1994).

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 397
Copyright
Copyright © Kluwer 1995 

References

Howell, S.B. (1986) Astronomical Journal, 91, 171.Google Scholar
Saffer, R.A. et al. (1994) Astrophysical Journal, 432, 351.Google Scholar
Usher, P.D. and Mitchell, K.J. (1990) Astrophysical Journal Supplement, 74, 885.CrossRefGoogle Scholar