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Cepheid Binaries: Frequency and Mass Ratios1

Published online by Cambridge University Press:  12 April 2016

Nancy Remage Evans
Nancy Remage Evans*
Affiliation:
Department of Physics and Astronomy, York University, 4700 Keele St., North York, Ontario, M3J 1P3, Canada

Abstract

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Ultraviolet spectroscopy with the IUE satellite has been used to survey all Cepheids brighter than 8th magnitude to identify blue companions. The derived binary frequency is 21% with blue companions which implies that 34% would have been found from a large radial velocity survey. A second study has used deep IUE exposures of Cepheids showing orbital motion to determine the distribution of mass ratios in Cepheid binaries. Low mass companions are strongly preferred, especially when corrections for incompleteness are included.

Type
Part 1. The Scientific Programme
Information
International Astronomical Union Colloquium , Volume 155 , 1995 , pp. 252 - 253
Copyright
Copyright © Astronomical Society of the Pacific 1995

Footnotes

1

IUE Guest Observer

References

Evans, N.R. 1992, ApJ, 384, 220 Google Scholar
Evans, N.R. 1995, ApJ, May, in pressGoogle Scholar