Monitoring line profile changes in Kappa Orionis, B0.5 IA

Details Monitoring line profile changes in Kappa Orionis, B0.5 IA Monitoring line profile changes in Kappa Orionis, B0.5 IA

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..168s&link_type=abstract

Astronomy and Astrophysics, vol. 101, no. 2, Aug. 1981, p. 168-173.

Astronomy and Astrophysics

Astrophysics

1

Early Stars, Resonance Lines, Spectral Line Width, Stellar Spectra, Supergiant Stars, Ultraviolet Spectra, Astronomical Spectroscopy, Balmer Series, H Alpha Line, Stellar Winds, Variability, Visible Spectrum

Scientific paper

Line profile variability has been detected in the UV and visual spectra of the B0.5 Ia supergiant Kappa Orionis. Several UV observations of the O VI and N V doublets, of the Si III-1206 A resonance line and of the C III-1175 A metastable line, obtained with the highest resolution mode of the Copernicus satellite, and quasi-simultaneous H-alpha coude observations have been compared. The variability pattern of the UV resonance lines and of C III is remarkably similar when one compares the absorption part of their P Cygni profiles; H-alpha shows changes in extension of the absorption wings and depth of the reversal, which in one case is observed in emission. A relation between some of the H-alpha changes and a simultaneous episode of flux increase in the C III-1175 A line at about -150 km/s is suggested.

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