Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..568o&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 15, 1982, p. 568-577.
Astronomy and Astrophysics
Astronomy
9
B Stars, Resonance Lines, Stellar Luminosity, Stellar Spectra, Supergiant Stars, X Ray Sources, Ionization, Ions, Silicon, Spectral Line Width, Ultraviolet Astronomy
Scientific paper
The Auger ionization model is used to estimate the X-ray luminosities of supergiants of spectral types from B1.5 to B9. It is found that the ion N+4 is not useful in the B spectral range, while the C IV and Si IV line strengths are excellent diagnostics of X-ray luminosity, being only slightly affected by the diffuse radiation field. For the ion abundance calculations, the X-ray radiation field was assumed to be like that observed in early B supergiants and mass loss rates were estimated using an extrapolation of radio observations of earlier OB supergiants. X-ray luminosities were derived that are consistent with Einstein observatory results. Derived X-ray luminosities show a general bolometric magnitude decrease from early to late B supergiants.
Cassinelli Joe P.
Odegard Nils
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