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Title:
The distance to the Pleiades from orbital solution of the double-lined eclipsing binary HD 23642
Authors:
Munari, U.; Dallaporta, S.; Siviero, A.; Soubiran, C.; Fiorucci, M.; Girard, P.
Affiliation:
AA(INAF Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy), AB(Via Filzi 9, 38034 Cembra (TN), Italy), AC(INAF Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy; Astrophysical Observatory of the Department of Astronomy, University of Padova, 36012 Asiago (VI), Italy), AD(Observatoire Aquitain des Sciences de l'Univers, CNRS UMR 5804, BP 89, 33270 Floirac, France), AE(INAF Osservatorio Astronomico di Padova, Sede di Asiago, 36012 Asiago (VI), Italy), AF(Observatoire Aquitain des Sciences de l'Univers, CNRS UMR 5804, BP 89, 33270 Floirac, France)
Publication:
Astronomy and Astrophysics, v.418, p.L31-L34 (2004) (A&A Homepage)
Publication Date:
04/2004
Origin:
A&A
Astronomy Keywords:
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
DOI:
10.1051/0004-6361:20040124
Bibliographic Code:
2004A&A...418L..31M

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 ± 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.

The photometric and spectroscopic observations discussed in this paper are electronically available from the web page http://ulisse.pd.astro.it/HD_23642/

Based in part on spectra collected with the ELODIE spectrograph at the 1.93 m telescope of the Observatoire de Haute Provence (OHP), France.

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