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Chemically Peculiar Stars Among Spectroscopic Binaries – Revisited

Name: Chemically Peculiar Stars Among Spectroscopic Binaries – Revisited
Creator: Wilhelm Seggewiss
Keywords: 0103 physical sciences, 10. No inequality, 01 natural sciences

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 01 Jan 1993 English Publisher:Cambridge University Press (CUP)Journal:International Astronomical Union Colloquium, volume 138, pages 137-142 (issn: 0252-9211,

Authors: Wilhelm Seggewiss;

doi: 10.1017/s025292110002039x

Chemically Peculiar Stars Among Spectroscopic Binaries – Revisited

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Abstract

AbstractThis paper presents a new statistical investigation of peculiar A-type stars (Am, Ap, Hg-Mn) among spectroscopic binary (SB) stars. The relative frequency of Am (CP 1) stars is 55% in the spectral range A1 to A6 of main-sequence stars. The Ap (CP 2) stars amount to 15% in the range B9 to A2. The Hg-Mn stars are concentrated to the spectral types B8 to AO and reach a relative frequency of 23%. The Am SB stars have the shortest orbital periods and the smallest eccentricities (30% circular) whereas the Ap SB stars show a strong tendency to long periods and highly eccentric orbits (only 10% circular). The masses of the Am stars agree with the masses of non-peculiar SB stars of corresponding spectral type.

Related Organizations

University of Bonn
Germany

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