Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....65..301w&link_type=abstract
Astronomy and Astrophysics, vol. 65, no. 2, Apr. 1978, p. 301-304. Research supported by the Ministere de l'Education du Quebec
Astronomy and Astrophysics
Astrophysics
10
Hot Stars, Stellar Models, Stellar Radiation, White Dwarf Stars, X Ray Sources, Coronas, Far Ultraviolet Radiation, Neutrinos, Particle Density (Concentration), Radiative Transfer, Space Density, Stellar Atmospheres, Stellar Evolution, Stellar Luminosity, Thermal Emission
Scientific paper
The suggestion that hot, helium- and metal-poor white dwarfs may be significant thermal soft X-ray emitters is investigated using explicit model atmosphere calculations. These calculations, together with the soft X-ray survey of Vanderhill et al. (1975), place an improved upper limit on the space density (n) of white dwarfs with Te 100,000 K. It is found that n is less than about 0.000004/cu pc for an assumed interstellar neutral hydrogen density of 0.1/cu cm. This limit confirms, and in some cases extends, previous extreme-ultraviolet and soft X-ray limits and suggests that neutrino emission processes may dominate the pre-white-dwarf evolution of these stars.
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