Volume 498, Number 3, May II 2009
|Page(s)||949 - 960|
|Section||Catalogs and data|
|Published online||11 March 2009|
Laboratoire d'Astrophysique de l'École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Versoix, Switzerland e-mail: firstname.lastname@example.org
2 Observatoire de Genève, 51, Ch. des Maillettes, 1290 Sauverny, Switzerland
Accepted: 2 February 2009
Context. We conducted a long-term monitoring of solar-type dwarfs in 13 nearby open clusters, pc, over 19 years, but most individual radial velocities were never published, apart from a small number of spectroscopic binaries.
Aims. Our program was designed to study membership and duplicity, and to search for new cluster members.
Methods. We obtained 6070 radial velocities during 19 years of observations at the Haute-Provence Observatory (France) and 1130 during 13 years at ESO La Silla (Chile) for 1253 stars in the field of 13 open clusters. The zeropoint of the CORAVEL radial velocity system was improved and the new values supersede those published previously.
Results. The membership and binarity of solar-type stars in NGC 1976 (Orion), IC 2602, NGC 7092, and NGC 2682 are briefly discussed. For the entire sample, we confirmed the membership of 894 stars and discovered 150 new spectroscopic binaries among them. Added to those already known in the Hyades and Coma Berenices, the number of member spectroscopic binaries is 188. The overall binary frequency is 30% (188/618) for stars with at least 2 measurements. Since no spectroscopic binaries were found among its 26 members, IC 2602 may however represent an exception. New orbital elements were computed with the updated values of the radial velocities for 66 systems, representing 55 members and 11 non-members.
Conclusions. This paper is the final report from our team of CORAVEL radial velocities of solar-type dwarfs in nearby open clusters. All CORAVEL observations for dwarfs and red giants in open clusters are now available in electronic form.
Key words: galaxy: open clusters and associations: general / stars: late-type / stars: binaries: spectroscopic / techniques: radial velocities
Based on observations collected at the Haute-Provence Observatory (France) and with the Danish 1.54-m at the European Southern Observatory, La Silla, Chile. This reaserch has made use of the WEBDA database, operated at the Institute for Astronomy of the University of Vienna, and of the SIMBAD database, operated at CDS, Strasbourg, France This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
© ESO, 2009
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