Abstract
ABSTRACT New coud6 spectrograms of the OB binary HD 163181 are analyzed. An absorption spectrum attributed to the secondary is reported for the first time, and it is deduced that the secondary is more massive and less luminous than the supergiant primary. The primary shows phase-dependent mass-loss characteristics and the present light curve suggests that it is near its Roche limiting radius. Nitrogen and oxygen abundances are unusual in the primary spectrum. The nature of the secondary is discussed. Key words: binaries - early-type stars - emission-line stars - mass loss
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Schedule a callMore From: Publications of the Astronomical Society of the Pacific
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