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The luminosities of the binary Cepheids SU Cyg, SU Cas, and W Sgr

  • Cepheids
  • Conference paper
  • First Online:
Stellar Pulsation

Part of the book series: Lecture Notes in Physics ((LNP,volume 274))

Abstract

Absolute magnitudes for binary classical Cepheids have been derived by ratioing IUE low dispersion spectra in regions where the blue companion dominates with spectra of main sequence spectral type standards. IUE spectra are also used to determine the magnitude difference between the Cepheid and the blue companion. Preliminary absolute magnitudes determined in this way for SU Cyg and W Sgr are in agreement with the absolute magnitudes of Sandage and Tammann, and Caldwell and also with those of Schmidt within the Om2 estimated uncertainty. The absolute magnitude of SU Cas is in better agreement with the PLC relations if it is pulsating in the first overtone mode.

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References

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Author information

Authors and Affiliations

  1. Computer Sciences Corporation, IUE Observatory, Canada

    Nancy Remage Evans (IUE Guest Observer)

  2. David Dunlap Observatory, University of Toronto, Canada

    Nancy Remage Evans (IUE Guest Observer)

  3. Instituto de Astronomia, UNA Mexico, Mexico

    Armando Arellano-Ferro

Authors
  1. Nancy Remage Evans
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  2. Armando Arellano-Ferro
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Editor information

A. N. Cox W. M. Sparks S. G. Starrfield

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© 1987 Springer-Verlag

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Evans, N.R., Arellano-Ferro, A. (1987). The luminosities of the binary Cepheids SU Cyg, SU Cas, and W Sgr. In: Cox, A.N., Sparks, W.M., Starrfield, S.G. (eds) Stellar Pulsation. Lecture Notes in Physics, vol 274. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-17668-3_201

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  • DOI: https://doi.org/10.1007/3-540-17668-3_201

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-17668-8

  • Online ISBN: 978-3-540-47754-9

  • eBook Packages: Springer Book Archive

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