Hostname: page-component-77c89778f8-5wvtr Total loading time: 0 Render date: 2024-07-20T00:00:38.196Z Has data issue: false hasContentIssue false
  • English
  • Français

Chemically Peculiar Stars Among Spectroscopic Binaries – Revisited

Published online by Cambridge University Press:  12 April 2016

Wilhelm Seggewiss
Wilhelm Seggewiss*
Affiliation:
Sternwarte der Universität Bonn, Auf dem Hügel 71 D-5300 Bonn 1, Germany

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

This 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.

Type
I. General Properties of CP Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 137 - 142
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Batten, A.H. 1973, Binary and Multiple Systems of Stars, Pergamon Press, Oxford.Google Scholar
Batten, A.H., Fletcher, J.M., and MacCarthy, D.G. 1989, Eighth Catalogue of Orbital Elements of Spectroscopiec Binary Systems, Publ. Dominion Astrophys. Obs. Vol. 17.Google Scholar
Hoffleit, D. 1982, The Bright Star Catalogue, Yale Univ. Obs., New Haven.Google Scholar
Kholopov, P.N., and Samus, N.N. (eds.) 1985-1990, General Catalogue of Variable Stars, NAUKA Publ. House, Moscow.Google Scholar
Popper, D.M. 1980, Ann. Rev. Astron. Astrophys., 18, 115.Google Scholar
Renson, P., Gerbaldi, M., and Catalano, F.A. 1991, Astron. Astrophys. Suppl. Ser., 89, 429.Google Scholar
Schneider, H., Catalano, F.A., and Leone, F. 1987, Hvar Obs. Bull., 11, 23.Google Scholar
Seggewiss, W. 1981, in Upper Main Sequence Chemically Peculiar Stars, ed. Renson, P., Coll. Internat. Liège 23, p. 183. Google Scholar