The X-ray emission from O stars.

Details The X-ray emission from O stars. The X-ray emission from O stars.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc....9k&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 9 - 12

Astronomy and Astrophysics

Astrophysics

25

O Stars: X Rays, O Stars: X-Ray Luminosities, O Stars: Stellar Winds

Scientific paper

Stars of spectral type O are soft X-ray emitters with luminosity log Lx/Lbol ≍ -7. The authors have obtained pointed ROSAT PSPC observations of 42 stars that cover the full range of luminosity classes for spectral types between O3 and O9. They analyze these data by assuming a 2-component wind plasma which consists of: (i) a cold, X-ray absorbing gas described by stationary NLTE models of radiatively driven winds; (ii) an embedded ensemble of randomly distributed shocks that heat the wind locally to X-ray temperatures, after which the gas cools either by radiative energy losses or by adiabatic expansion. From model fits to ROSAT spectra they derive X-ray properties of O stars, i.e., their X-ray luminosity, shock temperature, and the volume filling factor of hot gas.

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