Red giants in open clusters. VII. Melotte 71.

Details Red giants in open clusters. VII. Melotte 71. Red giants in open clusters. VII. Melotte 71.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324...91m&link_type=abstract

Astronomy and Astrophysics, v.324, p.91-96

Astronomy and Astrophysics

Astrophysics

8

Cluster: Open, Individual: Mel 71 (Cl Melotte 71), Binaries: Spectroscopic, Hr Diagram

Scientific paper

New CORAVEL radial-velocity observations and UBV photometry of 24 red giants in the field of the intermediate-age open cluster Mel 71 are analysed for membership and duplicity. The membership of 16 stars is confirmed, one star is a possible member, and 8 spectroscopic binaries have been discovered, all amongst the cluster stars. Four of their orbits have been determined, with periods ranging from 74 to 1627 days. The mean cluster velocity is +50.14+/-0.14 (s.e.)km/s, and the binary frequency is unusually high (8/16=50%). The best isochrone fit to the observed colour-magnitude digram is obtained for logt=9.00 and Z=0.008. However, some discrepancies appear between the observed and predicted locations of the red giant clump.

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