Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..280h&link_type=abstract
Astronomy and Astrophysics, vol. 84, no. 3, Apr. 1980, p. 280-283.
Astronomy and Astrophysics
Astrophysics
19
Abundance, Helium, Stellar Atmospheres, White Dwarf Stars, X Ray Spectra, Atmospheric Models, Spectrum Analysis, Stellar Spectra
Scientific paper
The ultra soft X-ray spectra of the hot white dwarf HZ 43 in the range 40-200 A obtained recently by Bleeker et al. (1978) have been fitted by hydrogen-helium model atmospheres with various helium abundances and effective temperatures. It is shown that the soft X-ray spectrum is not consistent with these models. Satisfactory fits can be obtained with models which have an increasing helium abundance with depth in the atmosphere. For HZ 43 a pure hydrogen layer with a column mass of about 1 g/sq cm on top of a helium rich (helium abundance greater than or equal to 0.1 by number) atmosphere is consistent with the optical, ultraviolet, extreme ultraviolet and ultra soft X-ray data.
Heise Jaret
Huizenga H.
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