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An interferometric view on binarity and circumstellar envelopes of Cepheids

Published online by Cambridge University Press:  18 February 2014

A. Gallenne ,
P. Kervella ,
A. Mérand ,
J. D. Monnier ,
J. Breitfleder ,
G. Pietrzyński  and
W. Gieren
A. Gallenne
Affiliation:
Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile email: [email protected]
P. Kervella
Affiliation:
LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Université Paris Diderot, 5 Place Jules Janssen, F-92195 Meudon, France
A. Mérand
Affiliation:
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
J. D. Monnier
Affiliation:
Astronomy Department, University of Michigan, 1034 Dennison Bldg, Ann Arbor, MI 48109-1090, USA
J. Breitfleder
Affiliation:
LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Université Paris Diderot, 5 Place Jules Janssen, F-92195 Meudon, France European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
G. Pietrzyński
Affiliation:
Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile email: [email protected] Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
W. Gieren
Affiliation:
Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile email: [email protected]
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Abstract

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Optical interferometry is the only technique giving access to milli-arcsecond (mas) resolution at infrared wavelengths. For Cepheids, this is a powerful and unique tool to detect the orbiting companions and the circumstellar envelopes (CSE). CSEs are interesting because they might be used to trace the Cepheid evolution history, and more particularly they could impact the distance scale. Cepheids belonging to binary systems offer an unique opportunity to make progress in resolving the Cepheid mass discrepancy. The combination of spectroscopic and interferometric measurements will allow us to derive the orbital elements, distances, and dynamical masses. Here we focus on recent results using 2- to 6-telescopes beam combiners for the Cepheids X Sgr, T Mon and V1334 Cyg.

Keywords

stars: variables: Cepheidsstars: circumstellar matterbinaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 411 - 412
Copyright
Copyright © International Astronomical Union 2014 

References

Gallenne, A., Kervella, P., & Mérand, A. 2011, A&A, 538, A24Google Scholar
Gallenne, A., Monnier, J. D., Mérand, A., et al. 2013a, A&A, 552, A21Google Scholar
Gallenne, A., Mérand, A., Kervella, P., et al. 2013b, A&A, 558, A140Google Scholar
Monson, A. J., Freedman, W. L., Madore, B. F., et al. 2012, ApJ, 759, 146CrossRefGoogle Scholar