Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237...61m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 1, Oct. 1990, p. 61-72. Research supported by SNSF.
Astronomy and Astrophysics
Astrophysics
67
Binary Stars, Open Clusters, Red Giant Stars, Stellar Evolution, Astronomical Photometry, Color-Magnitude Diagram, Radial Velocity, Spectroscopic Analysis, Open Clusters, Red Giants, Spectroscopic Binaries, Stellar Evolution
Scientific paper
Coravel radial velocities of 93 red giants in five open clusters older than the Hyades (NGC 2360, 2423, 5822, 6811 and IC 4756) are analyzed for membership and binary detection. Seventeen binaries have been discovered among the 71 members, resulting in a binary percentage of 27%. One new orbit has been determined in IC 4756, with a long period (2000 days) and a very small eccentricity (e =0.04).
The cluster ages are around 2.2 109 yr (9.3
Mayor Marcel
Mermilliod Jean-Claude
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