Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..713s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Nov. 1981, p. 713-720. Research supported by the Radcliffe Trust.
Astronomy and Astrophysics
Astronomy
29
Binary Stars, Early Stars, Stellar Mass Ejection, Stellar Spectra, Stellar Winds, X Ray Spectra, O Stars, Proportional Counters, Spectral Resolution, Stellar Luminosity, Stellar Temperature
Scientific paper
The transfer of X-rays through a uniform stellar wind is studied as a means to determine effective stellar temperatures and mass loss rates. Five binary O-stars were observed with the imaging proportional counter onboard the Einstein Observatory. Luminosities (0.2-3 keV) ranged from 2 x 10 (to the 32nd) to 1.2 x 10 (to the 33rd) erg/sec, suggesting emission temperatures of 5-8 million K; no evidence was found for strong soft X-ray absorption. Trials with several models indicated that X-rays arise near the base of the winds and propagate through the column density of the wind material. X-ray absorption and attenuation ratios were calculated for different ions detected in the outstreaming winds and mass loss rates were obtained for zeta Puppis, accurate to within a factor of four. Better accuracy will depend on higher spectral resolution, better knowledge of stellar and coronal emission, and the acceleration and abundances of wind material.
Fabian Andrea C.
Stewart Gordon C.
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