Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l.149d&link_type=abstract
Astrophysical Journal, vol. 206, June 15, 1976, pt. 2, p. L149-L152.
Astronomy and Astrophysics
Astrophysics
17
Atmospheric Models, Far Ultraviolet Radiation, Stellar Atmospheres, Ultraviolet Spectra, White Dwarf Stars, H Ii Regions, Particle Interactions, Planetary Nebulae, Stellar Luminosity, Stellar Models
Scientific paper
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.
Durisen Richard H.
Savedoff Malcolm P.
Van Horn Hugh M.
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