Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..564m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 20, 1991, p. 564-574.
Astronomy and Astrophysics
Astrophysics
41
B Stars, Emission Spectra, Extreme Ultraviolet Radiation, Main Sequence Stars, X Ray Spectra, Cosmic Plasma, Extreme Ultraviolet Explorer Satellite, Shock Wave Propagation, Stellar Atmospheres, Stellar Models, Stellar Winds
Scientific paper
The characteristics of EUV lines produced in high-temperature X-ray emitting regions of early B stars are investigated. Estimates of EUV spectral line fluxes for single-and multitemperature plasma models for three nearby main-sequence B stars are presented. The plasma models are constrained by X-ray spectral data and are based on insights from previous hydrodynamics calculations of shocks propagating through hot star winds. The importance of EUV emission lines in determining the properties of the X-ray-emitting regions of hot stars is demonstrated. It is shown that EUV emission lines from B stars with low interstellar medium hydrogen column densities may be detectable with the moderate-resolution spectrometers of the EUVE satellite. The effects of Doppler spreading and the time-dependent attenuation of the overlying wind on line profiles are investigated, and consideration is given to how spectral observations can be used to determine temperatures, velocities, and locations of the emitting plasma.
Cassinelli Joe P.
MacFarlane Joseph J.
Vallerga John V.
Vedder Peter W.
Waldron Wayne L.
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