EDP Sciences
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Volume 436, Number 1, June II 2005
Page(s) 253 - 262
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20042075

A&A 436, 253-262 (2005)
DOI: 10.1051/0004-6361:20042075

VLTI/VINCI diameter constraints on the evolutionary status of $\delta$ Eri, $\xi$ Hya, $\eta$ Boo

F. Thévenin1, P. Kervella2, B. Pichon1, P. Morel1, E. Di Folco3 and Y. Lebreton4

1  Laboratoire Cassiopée, UMR 6202 CNRS, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
2  Laboratoire d'Études Spatiales et d'Instrumentation Astrophysique (LESIA), UMR 8109 du CNRS, Observatoire de Paris, Section de Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France
3  European Southern Observatory, Karl-Schwarzschild Strasse 2, 85748 Garching, Germany
4  GEPI, UMR 8111 CNRS, Observatoire de Paris, Section de Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France

(Received 27 September 2004 / Accepted 16 January 2005 )

Using VLTI/VINCI angular diameter measurements, we constrain the evolutionary status of three asteroseismic targets: the stars $\delta$ Eri, $\xi$ Hya, $\eta$ Boo. Our predictions of the mean large frequency spacing of these stars are in agreement with published observational estimations. Looking without success for a companion of $\delta$ Eri, we doubt its classification as an RS CVn star.

Key words: stars: evolution -- stars: fundamental parameters -- techniques: interferometric

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© ESO 2005

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