Binarity in the Pleiades Cluster, a Progress Report

Details Binarity in the Pleiades Cluster, a Progress Report Binarity in the Pleiades Cluster, a Progress Report

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340702w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #407.02; Bulletin of the American Astronomical Society, Vol. 41, p.202

Astronomy and Astrophysics

Astrophysics

Scientific paper

In an effort to understand the orbital eccentricity versus period relation and other properties of binary stars in the Pleiades cluster, we are carrying out a spectroscopic survey in the cluster with the facilities at the Harvard-Smithsonian Center for Astrophysics. An additional goal is to provide targets for astrometric observation by SIM, in the context of a Key Project to determine the mass-luminosity relation in the cluster. Over the past 25 years we have collected more than 2500 echelle spectra of 262 objects in the Pleiades area. For each star we have determined the effective temperature and projected rotational velocity using cross-correlation techniques. Our radial velocities have allowed us to obtain orbital solutions for 19 spectroscopic binaries so far, of which 6 are new. We have also detected the secondary components of several previously known single-lined binaries, converting them into double-lined. Altogether we have 25 binaries with orbits that are confirmed members of the cluster. These have been used to establish the tidal circularization period, and to compare with the predictions of tidal theory. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.

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