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Binarity and Cluster Membership of Classical Cepheids

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
L. Szabados ,
Z.T. Kiss  and
P. Klagyivik
L. Szabados
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, Budapest, Hungary
Z.T. Kiss
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, Budapest, Hungary
P. Klagyivik
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, Budapest, Hungary
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Abstract

Companions exert adverse effects on the relationships valid for Cepheids. Physical companions may also cause observable effects (e.g., phase jump in the pulsation, slight excitation of non-radial modes). Many new binaries among Cepheids can be revealed by using radial velocity measurements to be made by Gaia and by deriving astrometric orbit from data to be obtained over the five years of the Gaia mission.

Cluster membership of Cepheids also facilitates the calibration of the period-luminosity relationship independently of the pulsation. A brief summary on the membership of Cepheids in clusters is also given.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 441 - 444
Copyright
© EAS, EDP Sciences 2011

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References

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