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Astron. Astrophys. 317, 789-792 (1997)

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The mean angular diameter of [FORMULA]  Cephei measuredby optical long-baseline interferometry

D. Mourard 1, D. Bonneau 1, L. Koechlin 2, A. Labeyrie 3, F. Morand 4, Ph. Stee 1, I. Tallon-Bosc 5 and F. Vakili 1

1 Observatoire de la Côte d'Azur, URA CNRS 1361, F-06460 St. Vallier de Thiey, France
2 Laboratoire Astrophysique de Toulouse, 14 avenue E.Belin, F-31400 Toulouse, France
3 Collège de France & Observatoire de Haute Provence, F-04870 Saint Michel l'Observatoire, France
4 Collège de France & Observatoire de la Côte d'Azur, F-06460 St. Vallier de Thiey, France
5 Centre de Recherche Astronomique de Lyon, UMR CNRS 5574, 9 avenue Charles Andre, F-69561 St Genis Laval Cedex, France


Long baseline interferometric observations of [FORMULA]  Cep at the "Grand Interféromètre à deux Télescopes" give the first measurement of its mean angular diameter. Combined with the mean linear radius deduced from spectroscopic data, the mean angular diameter gives an improved distance determination for [FORMULA]  Cep. Size pulsations are marginally detected and the measured amplitude is consistent with the theoretical predictions.

Key words: stars: Cepheids – stars: individual: ffi Cep – techniques: interferometric – stars: fundamental parameters

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998