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High Signal-To-Noise Ratio - the Spectroscopic Key to Algol Systems

Published online by Cambridge University Press:  12 April 2016

Jocelyn Tomkin
Jocelyn Tomkin*
Affiliation:
Astronomy Department,University of Texas, Austin,Texas,, 78712,U.S.A.

Abstract

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The usefulness of high signal-to-noise-ratio spectra for both radial-velocity and abundance studies of Algol systems is emphasised. It is shown that division by a hot star is a worthwhile step in pursuit of this objective. A preliminary analysis of high signal-to-noise-ratio, red and near-infrared, Reticon observations of R CMa shows that its primary has solar CNO abundances within the 0.3 dex observational error. The low-mass (0.17 m⊙) secondary of this Algol system must have lost a large fraction of its original mass. Some of this material would have been extensively processed during the secondary’s main-sequence lifetime and would therefore have had a highly non-solar CNO-abundance distribution. The lack of serious contamination of the primary’s abundances is consistent with most, but not all, plausible mass-transfer scenarios.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 107: Algols , 1989 , pp. 245 - 255
Copyright
Copyright © Kluwer 1989

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