Simultaneous X-ray and ultraviolet observations of Epsilon Orionis and Kappa Orionis

Details Simultaneous X-ray and ultraviolet observations of Epsilon Orionis and Kappa Orionis Simultaneous X-ray and ultraviolet observations of Epsilon Orionis and Kappa Orionis

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..205c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 205-216.

Astronomy and Astrophysics

Astronomy

12

Early Stars, Satellite Observation, Stellar Spectra, Supergiant Stars, Ultraviolet Astronomy, X Ray Sources, B Stars, Iue, O Stars, Oao 3, Spaceborne Astronomy, Ultraviolet Radiation, X Ray Astronomy

Scientific paper

Simultaneous observations were made with the Einstein Observatory, the International Ultraviolet Explorer, and the Copernicus satellite of the supergiant stars η Ori (B0 Ia) and κ Ori (B0.5 Ia). The X-ray observations spanned periods of 7 hours and 10 hours, and the ultraviolet observations spanned 15 and 18 hours for ηOri and κ Ori, respectively. For either star, no variations were detected in the X-ray flux or spectrum or in the ultraviolet line profiles of Auger enhanced ionization states. For ηOri, the X-ray count rate was the same as it was during an observation 11 months earlier, while for κ Ori, the X-ray count rate was 46% larger than it was 11 months earlier. This change could be explained by an increase in the source temperature from 106.3 K to 106.4 K, or by an increase in the source emission measure of 46 %, or by a decrease in the column density of the intervening matter of several times 1020 cm-2. The ultraviolet line profiles are found to be insensitive to changes of X-ray flux which are less than 50 %. Various constraints imposed on current models for the X-ray production in early-type stars are discussed.

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