Publication Date:
2019-07-13
Description:
The masses, radii, temperature, luminosities and compositions of white dwarf stars are discussed, with particular emphasis on those areas in which considerable work remains to be done. It is pointed out that radii for stars of known parallax are available, together with masses and their variance. Consideration is then given to the difficulties involved in the determination of the temperatures of the hottest stars and helium stars by means of Stromgren or multichannel photometry, and it is noted that the frequency of binaries among the hottest degenerates seems too high to be due to chance. Results of IUE observations of the UV spectra of three DA and one DO star are discussed, with attention given to the similarities between UV-derived and ground-based determinations of temperatures and surface gravities. The metal abundances of hydrogen and helium degenerate stars are finally considered, and spectral classes and abundances of the helium atmosphere degenerates are tabulated.
Keywords:
ASTROPHYSICS
Type:
Annual Workshop on Novae, Dwarf Novae and Other Cataclysmic Variables; Aug 03, 1979|Colloquium on White dwarfs and variable degenerate stars; Jul 30, 1979 - Aug 02, 1979; Rochester, NY; US
Format:
text
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