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Arguments Indicating that Ap and Am Stars are Evolved Spectroscopic Binaries

Published online by Cambridge University Press:  30 March 2016

E.P.J. van den Heuvel
E.P.J. van den Heuvel*
Affiliation:
Sterrenwacht ‘Sonnenborgh’, Utrecht, The Netherlands, and Sterrenkundig Instituut der Vrije Universiteit, Brussels, Belgium

Extract

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Roughly three types of evolution of spectroscopic binaries may occur:

Case (a): the primary fills its Roche limit already before the end of core hydrogen burning;

Case (b): the primary fills its Roche limit after core hydrogen exhaustion but before the onset of helium burning, and

Case (c): the primary does not fill its Roche limit before the end of core helium burning.

Since long-period variables of Population I as well as Population II may reach radii of 10 AU, case (c) will occur in systems with periods up to 100 years. Since about 50% of the A and B stars are spectroscopic binaries, many evolved spectroscopic binaries are expected to occur in the galactic system. Computations show that, using the mass-ratio distribution of unevolved systems derived by Kuiper, the number of systems with one evolved component is expected to be at least as large as the number of unevolved systems, in the spectral regions A and B.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 1: Highlights of Astronomy. As presented at the XIIIth General Assembly of the IAU, 1967 , 1968 , pp. 420 - 431
Copyright
Copyright © Reidel 1968

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