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Cepheid pulsations resolved by interferometry

Published online by Cambridge University Press:  10 September 2015

N. Nardetto  and
P. Kervella
N. Nardetto
Affiliation:
Laboratoire Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur, Nice, France
P. Kervella
Affiliation:
LESIA, Observatoire de Paris, CNRS UMR 8109, UPMC, Université Paris Diderot, 5 place Jules Janssen, 92195 Meudon, France
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Abstract

The very high spatial resolution provided by current interferometers (VLTI, CHARA, …) makes it possible to measure directly the change in angular diameter of more than thirty Cepheids over their pulsation cycle. When combined with radial velocity measurements, this allows us to measure precisely their distances in a quasi-geometrical way. This is an essential information to calibrate the Cepheid's Period-Luminosity law. On the other hand, a careful analysis of the dynamical structure of their atmosphere is required to avoid biases in their distance determination.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 70: What the Highest Angular Resolution Can Bring to Stellar Astrophysics? , 2014 , pp. 249 - 256
Copyright
© EAS, EDP Sciences, 2015

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