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Issue A&A
Volume 418, Number 3, May II 2004
Page(s) L31 - L34
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040124



A&A 418, L31-L34 (2004)
DOI: 10.1051/0004-6361:20040124

Letter

The distance to the Pleiades from orbital solution of the double-lined eclipsing binary HD 23642

U. Munari1, S. Dallaporta2, A. Siviero1, 3, C. Soubiran4, M. Fiorucci1 and P. Girard4

1  INAF Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy
2  Via Filzi 9, 38034 Cembra (TN), Italy
3  Astrophysical Observatory of the Dept. of Astronomy, Univ. of Padova, 36012 Asiago (VI), Italy
4  Observatoire Aquitain des Sciences de l'Univers, CNRS UMR 5804, BP 89, 33270 Floirac, France

(Received 27 February 2004 / Accepted 18 March 2004 )

Abstract
Combining precise B, V photometry and radial velocities, we have been able to derive a firm orbital solution and accurate physical parameters for the newly discovered eclipsing binary HD 23642 in the Pleiades open cluster. The resulting distance to the binary and therefore to the cluster is 132  $\pm$ 2 pc. This closely confirms the distance modulus obtained by classical main sequence fitting methods ( m - M= 5.60 or 132 pc), moving cluster techniques and the astrometric orbit of Atlas. This is the first time the distance to a member of the Pleiades is derived by orbital solution of a double-lined eclipsing binary, and it is intended to contribute to the ongoing discussion about the discordant Hipparcos distance to the cluster.


Key words: stars: binaries: eclipsing -- stars: distances -- stars: fundamental parameters -- stars: individual: HD 23642 -- stars: HR and C-M diagrams -- Galaxy: open clusters and associations: individual: Pleiades

Offprint request: U. Munari, munari@pd.astro.it

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© ESO 2004


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