Red giants in open clusters. XI. Membership, duplicity, and structure of NGC 2477

Details Red giants in open clusters. XI. Membership, duplicity, and structure of NGC 2477 Red giants in open clusters. XI. Membership, duplicity, and structure of NGC 2477

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...423..189e&link_type=abstract

Astronomy and Astrophysics, v.423, p.189-197 (2004)

Astronomy and Astrophysics

Astrophysics

16

Stars: Binaries: Spectroscopic, Techniques: Radial Velocities, Star: Late-Type, Galaxy: Open Clusters And Associations: Individual: Ngc 2477

Scientific paper

New, accurate radial velocities and photoelectric UBV photometry of 83 red-giant candidates in the field of the rich, intermediate-age open cluster NGC 2477 ([Fe/H]= -0.05, age ≃1 Gyr) are presented and discussed. From 49 constant-velocity members we find a mean cluster velocity of +7.32±0.13 km s-1 and confirm the membership of 76 of the stars. Among the cluster members, we identify 26 definite and 1 probable spectroscopic binaries and determine orbits for 13 of these systems, with periods ranging from 40 to 4578 days. The binary frequency is thus rather high (27/76 = 36%). The observed internal radial velocity dispersion of the cluster, as determined from the single member stars, is 0.93 km s-1, corrected for the small average observational error of 0.22 km s-1. Fitting King-type models to the observed stellar density distribution and velocity dispersion, and assuming a distance of 1.25 kpc, we find the core and tidal radii of NGC 2477 to be 1.8 and 8.1 pc, respectively, and estimate that the mass of cluster stars down to V = 17, corresponding to ˜1 M&sun;, is at least 5400 M&sun;. The substantial differential reddening of NGC 2477 requires a more detailed study before definitive isochrone fits can be made.
Based on observations collected with the Danish 1.54-m and ESO 1-m telescopes at the European Southern Observatory, La Silla, Chile, and with the University of Toronto 0.6-m telescope at Las Campanas Observatory, Chile.
Full Tables 1 and 2 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/423/189

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