Predicted extreme-ultraviolet line emission for nearby main-sequence B stars

Abstract

view Abstract Citations (68) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Predicted Extreme-Ultraviolet Line Emission for Nearby Main-Sequence B Stars Macfarlane, J. J. ; Cassinelli, J. P. ; Welsh, B. Y. ; Vedder, P. W. ; Vallerga, J. V. ; Waldron, W. L. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1991 DOI: 10.1086/170614 Bibcode: 1991ApJ...380..564M Keywords: 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; Astrophysics; SHOCK WAVES; STARS: EARLY-TYPE; STARS: EMISSION-LINE; STARS: WINDS; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (3)