Comparison of the Broad-Band and Multichannel Colors of White Dwarfs
Abstract
The published braod-band UBV and multichannel spectrophotometry is correlated for the white dwarfs to provide the nonlinear color-color transformations between these systems. The hydrogen lines and continuum produce a bifurcation separating hydrogen-dominated and helium-dominated atmospheres in color-color diagrams, and account, in part, for the Eggen-Greenstein two sequences. The UBV color-luminosity diagram also is split over a wide range of temperatures; (U-V)0 is approximately calibrated by temperature for the two dominant composition types. Mapping of M(V), (U-V)0 shows that most He-atmosphere in the steep dependence of M(V) on (U-V)0 from 8000 K to 13,000 K; (U-V)0 is a poor luminosity indicator in that range of effective temperature. Otherwise, good UBV photometry proves quite useful for the study of white dwarfs.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- January 1988
- DOI:
- 10.1086/132137
- Bibcode:
- 1988PASP..100...82G
- Keywords:
-
- Broadband;
- Line Spectra;
- Stellar Color;
- Stellar Spectrophotometry;
- Ubv Spectra;
- White Dwarf Stars;
- Black Body Radiation;
- Stellar Atmospheres;
- Stellar Composition;
- Stellar Luminosity;
- Stellar Temperature;
- Astronomy;
- STARS: WHITE DWARFS;
- PHOTOMETRY