Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..125m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 125-141. Research supported by SNSF.
Astronomy and Astrophysics
Astrophysics
77
Binary Stars, Open Clusters, Red Giant Stars, Stellar Evolution, Stellar Spectrophotometry, A Stars, Color-Magnitude Diagram, Radial Velocity, Stellar Orbits, Triple Stars
Scientific paper
The present analysis for membership-determination and binary-detection of radial velocity observations for 62 red giant stars in the Hyadeslike NGC 2447, 2539, 2632, 6633, and 6940 open clusters has yielded a binary percentage of the order of 25-33 percent. Twelve orbits have been determined, and two triple systems identified. At least nine of the ten stars found in the Hertzsprung gap are composite binaries of the (gK + dA) type; the radial velocity dispersion in each cluster is close to the value expected on the basis of the virial theorem, assuming typical values of the total mass of 1000 solar masses, and of a half-mass radius of 3 pc.
Mayor Marcel
Mermilliod Jean-Claude
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