Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..832w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 832-837. Research supported by the Center for Astrop
Astronomy and Astrophysics
Astronomy
41
Stellar Radiation, Stellar Winds, Wolf-Rayet Stars, X Ray Stars, Binary Stars, Black Holes (Astronomy), Companion Stars, Heao 2, Shock Waves, White Dwarf Stars
Scientific paper
Seven bright Wolf-Rayet (WR) stars were observed with the Einstein X-ray observatory; four were detected. The 0.15-4 keV fluxes of the detected stars (and the upper limits for the others) are consistent with the ratio of X-ray to bolometric luminosities observed for other early-type stars. The X-ray spectra of WR stars are also similar to those of OB stars, with most of the photons emerging with energies less than 1 keV. These observations support the idea that X-ray emission in all hot stars is produced by shocks in the wind. The X-ray flux of one of the stars, HD 50896, varied by a factor of 2 within half an hour on two of the three days when it was observed. The possible origin of these variations is discussed; it is concluded that the companion of HD 50896 is either a black hole or a white dwarf remnant of a massive star.
Long Knox S.
White Richard L.
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