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We present new Coravel radial-velocity obser- vations and photoelectric photometry in the UBV,DDO and Washington systems for a sample of red giant can- didates in the eld of the intermediate-age open cluster NGC 2354. Photometric membership probabilities show very good agreement with those obtained from Coravel radial velocities. The analysis of the photometric and kine- matical data allow us to conrm cluster membership for 9 red giants, one of them being a spectroscopic binary, while 4 conrmed spectroscopic binaries appear to be proba- ble members. We have also discovered 4 spectroscopic bi- naries not belonging to the cluster. A mean radial ve- locity of (33.40 0.27) km s 1 and a mean reddening E(B V )=0 :13 0.03 were derived for the cluster giants. NGC 2354 has a mean ultraviolet excess = 0 :03 0.01, relative to the eld K giants, and a mean new cyanogen anomaly CN = 0:035 0.007, both im- plying (Fe/H) 0 :3. The moderately metal-poor char- acter of NGC 2354 is conrmed using ve dierent metal abundance indicators of the Washington system. The clus- ter giant branch is formed by a well dened clump of 7 stars and 4 stars with high membership probabilities seem to dene an ascending giant branch. The whole red giant locus cannot be reproduced by any theoretical track.

Membership, binarity and metallicity of red giants in the southern open cluster NGC 2354