Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..427h&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
Two set of CPM stars were extracted from the AGK3 a while ago. The first one contains CPM stars with a high probability (99 %) to be physical binaries. For the second set, this probability was estimated around 60 %. In order to check these statistical estimations and also to select the actual physical binaries, a long program of radial velocity measurements was initiated, using the spectrovelocimeter Coravel. It includes the totality of late-type stars of the second set and a part of the first one. Several spectroscopic binaries were thus discovered, and orbits were derived for about 50 of them. All the wide pairs coming from the first set were confirmed as common spatial velocity stars, and the proportion of optical pairs in the second set is quite in agreement with our prediction. The sample of physical binaries thus obtained will be used for investigating the statistical properties of binary stars with wide separations (1000 AU or more).
Halbwachs Jean-Louis
Mayor Marcel
Udry Stephane
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