Red giants in open clusters. II - Orbits of ten spectroscopic binaries in NGC 2360, 2437, 2447, 5822, 5823, and 6475

Details Red giants in open clusters. II - Orbits of ten spectroscopic binaries in NGC 2360, 2437, 2447, 5822, 5823, and 6475 Red giants in open clusters. II - Orbits of ten spectroscopic binaries in NGC 2360, 2437, 2447, 5822, 5823, and 6475

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...79...11m&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 79, no. 1, July 1989, p. 11-18. Research supported by FNRS.

Astronomy and Astrophysics

Astrophysics

23

Binary Stars, Open Clusters, Radial Velocity, Red Giant Stars, Stellar Orbits, Astronomical Maps, Stellar Evolution

Scientific paper

This is the second paper in a series giving the results of a systematic program to detect spectroscopic binaries in open clusters and determine their orbits, based on radial velocity observations made with the Coravel scanners in both hemispheres. Here, orbits are presented for ten new (single-lined) spectroscopic binaries in six southern clusters (NGC 2360, 2437, 2447, 5822, 5823, and 6475). The orbital periods range from 65 to 1370 days, and the velocity semiamplitudes from 4.4 km/s to 26.0 km/s. All the binaries are confirmed cluster members except that in NGC 5823, a cluster for which the data on membership are ambiguous. The star NGC 2360 number 51 is noteworthy for having an eccentric orbit, despite its 98-day period. NGC 6475 number 134 has a circular orbit with a 217-day period, probably because the cluster is relatively young and the radii of its giants are, therefore, rather large; for cluster giants, the cutoff period for eccentric orbits decreases with age.

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