INVESTIGADORES
GONZALEZ Jorge Federico
artículos
Título:
Radial Velocities, Binarity, and Kinematic Membership in the Open Cluster NGC 2516
Autor/es:
GONZALEZ, J. F.; LAPASSET, E.
Revista:
ASTRONOMICAL JOURNAL
Editorial:
American Astronomical Society - IOP
Referencias:
Año: 2000 vol. 119 p. 2296 - 2302
ISSN:
0004-6256
Resumen:
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.
