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Title:
Four color photometry of DB white dwarfs
Authors:
Wegner, G.
Publication:
In: White dwarfs and variable degenerate stars; Proceedings of the Colloquium, July 30-August 2, 1979 and Proceedings of the Fourth Annual Workshop on Novae, Dwarf Novae and Other Cataclysmic Variables, Rochester, N.Y., August 3, 1979. (A81-17251 05-90) Rochester, N.Y., University of Rochester, 1979, p. 250-254. Research supported by the A. J. Cannon Fund, Unidel Foundation, and NSF.
Publication Date:
00/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
B Stars, Stellar Spectrophotometry, Ubv Spectra, White Dwarf Stars, Abundance, Hydrogen, Stellar Atmospheres, Stellar Models, Visual Photometry
Bibliographic Code:
1979wdvd.coll..250W

Abstract

Observations of 22 DB stars using the uvby photometric system are discussed. In the ((b-y), (u-b)) diagram, these objects define a relatively tight sequence, but the interpretation is hampered by the lack of a precise knowledge of atmospheric element abundances in these stars. The recent models of Koester (1979) show a larger gravity separation for the DB's using Stromgren photometry and appear to fit the observations better than earlier theoretical results. Due to the tightness of the DB sequence at the hot and cool ends, respectively, there appears to be evidence for restricted ranges in log g and the atmospheric hydrogen abundance.
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Database: Astronomy
Physics
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