On the white dwarf HZ 43 as an extreme-ultraviolet source.
Abstract
It is confirmed by atmospheric modeling that both the visual continuum and the XUV spectrum (60 to 600 A) of HZ 43 can be fitted self-consistently with the emergent flux from a stellar atmosphere having an effective temperature of about 125,000 K and log g of at least 7. An examination of theoretical white-dwarf cooling sequences and estimates of the stellar luminosity indicate that the parameters of HZ 43 are consistent with a hot white dwarf of 0.6 to 1.2 solar masses. The age is estimated to be as short as 100,000 years, raising the possibility that the star may have ejected a planetary nebula or may be surrounded by an expanding H II region. It is concluded that the detection of a planetary nebula shell or an H II region around HZ 43 may provide an astrophysical test of the direct neutrino-electron interaction.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1976
- DOI:
- 10.1086/182155
- Bibcode:
- 1976ApJ...206L.149D
- Keywords:
-
- Atmospheric Models;
- Far Ultraviolet Radiation;
- Stellar Atmospheres;
- Ultraviolet Spectra;
- White Dwarf Stars;
- H Ii Regions;
- Particle Interactions;
- Planetary Nebulae;
- Stellar Luminosity;
- Stellar Models;
- Astrophysics