Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..678n&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 678-683.
Astronomy and Astrophysics
Astronomy
13
Emission Spectra, Line Spectra, Stellar Coronas, Stellar Spectra, Supergiant Stars, X Ray Sources, B Stars, O Stars, Stellar Winds, Ultraviolet Astronomy
Scientific paper
A search was conducted for evidence of a coronal region at the base of the winds of Epsilon Ori and Kappa Ori, by means of high signal-to-noise observations at the forbidden lines of Fe X, at 6574 A, and Fe XIV, 5303 A. Both stars have been detected as soft X-ray sources, and show anomalously strong O VI lines in their UV spectra. Large coronal emission measures were expected from the total X-ray flux and Auger-enhanced ionization, but the fact that the iron coronal lines were not detected places new limits on the emission measure if the total temperature is in the range of 700,000-3,000,000 or more than 1,000,000 for Kappa Ori and 2,000,000 for Epsilon Ori. It is suggested that at least some of the X-rays arise, not from the base corona, but from source features farther out in the wind.
Anderson Martha C.
Cassinelli Joe P.
Nordsieck Kenneth H.
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