Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..402b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 402-408.
Astronomy and Astrophysics
Astrophysics
24
Astronomical Models, Emission Spectra, Wolf-Rayet Stars, X Ray Sources, Abundance, Line Spectra, Radiative Transfer, Stellar Atmospheres, Stellar Winds
Scientific paper
The observed X-ray emission from single W-R stars are modeled under reasonable assumptions, and the effect of the X-ray field in the ionization and excitation of the 'normal' wind component and its observable line spectrum is studied. The present model can reproduce the typical X-ray count rates observed with the EINSTEIN satellite, when plausible values are adopted for the temperature of the 'hot component' and its filling factor. The observed X-rays emerge from far out in the stellar wind, due to the large optical depths. Test calculations for WN stars reveal that the general effect on the emergent helium and nitrogen line spectrum is small and indistinguishable from an insignificant increase in stellar temperature. The only characteristic signature of the X-rays is a moderate strengthening of the N V lines.
Baum Eric
Hamann Wolf-Rainer
Koesterke Lars
Wessolowski Ulf
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