Radial Velocities, Binarity, and Kinematic Membership in the Open Cluster NGC 2516

Details Radial Velocities, Binarity, and Kinematic Membership in the Open Cluster NGC 2516 Radial Velocities, Binarity, and Kinematic Membership in the Open Cluster NGC 2516

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119.2296g&link_type=abstract

The Astronomical Journal, Volume 119, Issue 5, pp. 2296-2302.

Astronomy and Astrophysics

Astronomy

21

Stars: Binaries: Spectroscopic, Stars: Blue Stragglers, Galaxy: Open Clusters And Associations: Individual: Ngc Number: Ngc 2516, Techniques: Radial Velocities

Scientific paper

We present echelle spectroscopic observations for 36 bright (V<9.6) stars in the open cluster NGC 2516, including several blue straggler candidates and four red giants. Radial velocities are derived by cross-correlations using high signal-to-noise ratio standard spectra as templates. From 22 cluster members a mean cluster velocity of +22.0+/-0.2 km s-1 was derived. Membership probabilities of the observed stars are computed on the basis of their distance to the cluster center and kinematic criteria. We report the discovery of three double-lined spectroscopic binaries and several probable binaries among main-sequence stars. A binary frequency of more than 26% is found among the high-mass main-sequence stars. The blue straggler HD 66341 is a slowly rotating cluster member with constant velocity, while HD 66194 is a fast-rotating Be star with probable variations in radial velocity. Other blue straggler candidates, such as HD 65663, 65950, 66066, and 65987, must be considered turnoff stars. The observations presented here were obtained at the Complejo Astronómico El Leoncito (CASLEO), which is operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET) and the national universities of La Plata, Córdoba, and San Juan.

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