X-ray emission from certain nebulae formed by stellar wind

Astronomy and Astrophysics – Astronomy

Scientific paper

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Nebulae, Stellar Radiation, Stellar Spectra, Stellar Winds, X Ray Spectra, Gas Dynamics, Gas Ionization, Stellar Models, Temperature Distribution, X Ray Astronomy

Scientific paper

The fluxes and spectra of soft (0.1-4 keV) X-ray emission are calculated for six nebulae around stars with strong stellar winds: NGC 6888, S 119, S 308, NGC 2359, NGC 3199, and NGC 7635. Calculations are performed taking into account: (1) exact distributions of temperature and gas density for the gasdynamic model of Castor et al. (1975) and Weaver et al. (1977); and (2) deviations from the equilibrium gas ionization of the nebula.

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