J/A+A/324/91 J/A+A/324/91 Melotte 71 red giants radial velocities J -C Mermilliod J J Claria J Andersen M Mayor Astron. Astrophys. 324 91 1997 1997A&A...324...91M J/A+A/299/53 : Part IV. NGC 3680 and IC 4651 (Mermilliod+ 1995) J/A+A/307/80 : Part. V. NGC 2099 (Mermilliod+ 1996) J/A+A/319/481 : Part VI. 10 spectroscopic binaries orbits (Mermilliod+ 1997) Mermilliod & Mayor, Paper I =1989A&A...219..125M Mermilliod et al., Paper II =1989A&AS...79...11M Mermilliod & Mayor, Paper III = 1990A&A...237...61M Mermilliod et al., Paper IV =1995A&A...299...53M Mermilliod et al., Paper V =1996A&A...307...80M Clusters, open Radial velocities Stars, giant binaries: spectroscopic Hertzsprung-Russell (HR diagram) open clusters and associations: individual (Mel 71) 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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ID Star number --- HJD Heliocentric Julian Date d Comp Component of a double-lined binary --- RV Radial velocity km/s e_RV Error on the radial velocity km/s Patricia Bauer CDS 1997Jan13Jean-Claude Mermilliod <Jean-Claude.Mermilliod@obs.unige.ch> J_A+A_324_91.xml