WIYN Open Cluster Study: Precise Radial Velocities of Stars in the Old Cluster NGC 188

Details WIYN Open Cluster Study: Precise Radial Velocities of Stars in the Old Cluster NGC 188 WIYN Open Cluster Study: Precise Radial Velocities of Stars in the Old Cluster NGC 188

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.4105m&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #41.05; Bulletin of the American Astronomical Society, Vol. 32, p.1461

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have used the WIYN 3.5m telescope and Hydra Multi-Object Spectrograph since 1996 to obtain precise radial velocities for late-type proper-motion members of the open cluster NGC 188. Our magnitude limit of V < 16.5 includes solar-mass main-sequence stars, subgiants and giants, and blue stragglers. The survey includes a 0.75 deg diameter area on the sky. At present, the radial-velocity database contains over 5000 observations of more than 500 stars. The standard deviation of measurements for a representative single cluster member is 0.45 km/s and drops to 0.3 km/s for the brightest stars. The latter is the result of equal contributions from night-to-night variations of 0.2 km/s and fiber-to-fiber variations of 0.2 km/s. Comparison with an ongoing radial-velocity study at DAO by Harris and McClure indicates a 0.3 km/s difference in zero-point that remains to be resolved. More than 75 stars are confirmed spectroscopic binaries or candidate radial velocity variables; orbital solutions have been obtained for 52 of these. We will present results on mass segregation of the binaries, the tidal circularization cutoff, the short-period binary frequency, a newly discovered sub-subgiant binary, and the blue straggler binary population. This work is supported by NSF AST 9731302.

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