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Astron. Astrophys. 320, 74-78 (1997)


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Research Note

Investigation of the Pleiades cluster * **

III. Additional corona members

J.-C. Mermilliod 1, P. Bratschi 2 and M. Mayor 2

1 Institut d'Astronomie de l'Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland
2 Observatoire de Genève, CH-1290 Sauverny, Switzerland

Received 9 July 1996 / Accepted 9 September 1996

Abstract

The analysis of CORAVEL radial velocities of 93 stars selected on the basis of their proper motion and Geneva CCD photometric observations for 57 stars have permitted to identify 25 new members in the outer part of the Pleiades. Several spectroscopic binaries have been discovered, but their membership is not clear. Two orbits with short periods have been determined, but both stars are probably non-members. The total number of member stars in the outer part of the Pleiades in the spectral range F5-K0 (0.45 [FORMULA] 0.90) is now 81 which is comparable to the number of stars known in Hertzsprung's central area (88 stars) in the same spectral domain. Therefore at least 48 % of the F5-K0 main-sequence stars are located in the outer part of the cluster. And the census is probably still incomplete.

Key words: clusters: open: Pleiades – stars: binaries: spectroscopic – techniques: radial velocity

* based on observations collected at the Haute-Provence Observatory (France) and La Silla Observatory (Chile)
** Table 2 is available only in electronic form at the CDS via anonymous ftp to cds.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: J.-C. Mermilliod

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998

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