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Composite M V versus (V-I) 0 Diagram for Template Open Clusters
New CCD VI photometric data for 10 template open clusters withaccurately determined fundamental parameters are presented. From theobserved V versus V - I diagrams of the clusters, fiducial sequenceshave been defined and transformed into the Mv versus (V - I)0 diagram byaveraging sequences of template open clusters with similar ages. Theresulting composite Mv versus (V - I)0 diagram presents a homogeneousset of empirical isochrones in the age range between 5 Myr and 4 Gyr.These empirical isochrones show an overall very good agreement withthose computed from stellar evolutionary models. Theoretical isochroneswith moderate overshooting fit the observed main sequences better thanthe canonical ones for clusters older than 600 Myr. The present set ofempirical isochrones will be useful for the study of faint reddened openclusters
| Red giants in open clusters. I - Binarity and stellar evolution in five Hyades-generation clusters: NGC 2447, 2539, 2632, 6633, and 6940
The present analysis for membership-determination and binary-detectionof radial velocity observations for 62 red giant stars in the HyadeslikeNGC 2447, 2539, 2632, 6633, and 6940 open clusters has yielded a binarypercentage of the order of 25-33 percent. Twelve orbits have beendetermined, and two triple systems identified. At least nine of the tenstars found in the Hertzsprung gap are composite binaries of the (gK +dA) type; the radial velocity dispersion in each cluster is close to thevalue expected on the basis of the virial theorem, assuming typicalvalues of the total mass of 1000 solar masses, and of a half-mass radiusof 3 pc.
| Southern open clusters II. UBV and Hbeta photometry of 11 clusters between galactic longitudes 259d and 280d
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973A&AS....9...97V&db_key=AST
| Untersuchung der offenen Sternhaufen IC 4665, NGC 6633, IC 4756
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