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Title:
Spectrophotometry of the white dwarfs
Authors:
Greenstein, J. L.
Affiliation:
AA(Palomar Observatory, Pasadena, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 15, 1984, p. 602-620. (ApJ Homepage)
Publication Date:
01/1984
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, STELLAR COLOR, STELLAR LUMINOSITY, STELLAR SPECTROPHOTOMETRY, STELLAR TEMPERATURE, WHITE DWARF STARS, BINARY STARS, COLOR-COLOR DIAGRAM, COMPANION STARS, COOL STARS, H ALPHA LINE, OPACITY, STELLAR PARALLAX, STELLAR SPECTRA, SUPERNOVAE, TABLES (DATA)
DOI:
10.1086/161649
Bibliographic Code:
1984ApJ...276..602G

Abstract

Multicolor spectrophotometry of 319 white dwarfs gives magnitudes measured at six wavelengths. The resultant colors permit study of a number of peculiarities of energy distributions, as revealed in color-color diagrams. The major results are presented in a table, which includes luminosities, as deduced from (G-R) colors, by a quadratic interpolation formula based on 66 recent parallaxes. All stars are classified on a new quantitative scheme which both gives a temperature and indicates the major features of atmospheric composition. The color-color diagrams are used to study the distortions of the energy distribution of individual stars. The parallaxes and colors show that the "cosmic dispersion" is near ±0.40 mag and corresponds to a small spread in mass, probably 0.10 - 0.15 M_sun;. Implications of some of these largely empirical findings for the current theoretical interpretation of white dwarfs are briefly discussed.

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