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Spectral Characteristics of A-Type Stars in the Galactic Halo

  • C.J. Corbally (a1) and R.O. Gray (a2)
Abstract

Among 67 early A-type stars at high galactic latitudes, selected to have both small m1 and large c1 Strömgren photometric indices, we find about one third to have quite normal dwarf or subgiant spectra at MK classification dispersion. Those stars with peculiarities included 10 new λ Bootis stars, though none of these appeared significantly evolved. We wonder whether some of the metal-weak dwarf stars in our set may be field horizontal-branch equivalents of the blue, downward-curving, low-luminosity end of the blue horizontal-branch stars.

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Copyright
References
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Charbonneau, P. 1991, ApJ 372, L33
Corbally, C.J., and Gray, R.O. 1990, in Poster Papers Presented at the 145th Symposium of the IAU ed. Michaud, G., Tutukov, A., Bergevin, M. (Univ. of Montreal), p.55
Dworetsky, M. 1984, in The MK Process and Stellar Classification, ed. Garrison, R.F. (David Dunlap Observatory), p.389
Gray, R.O. 1988, AJ, 95, 220
Gray, R.O., and Corbally, C.J. 1992, in IAU Coll., No. 138, Peculiar Versus Normal Phenomena in A- Type and Related Stars, ed. Castelli, F. and Dworetsky, M.M.
Lambert, D.L. 1991, in IAU Symp., No. 145, Evolution of Stars: The Photospheric Abundance Connection, ed. Michaud, G. and Tutukov, A. (Dordrecht: Kluwer), p.451
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Proceedings of the International Astronomical Union
  • ISSN: -
  • EISSN: 0252-9211
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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