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Title:
Radial Velocities of Giant Stars in Globular Clusters
Authors:
Soderberg, A. M.; Pilachowski, C. A.; Barden, S. C.; Willmarth, D.; Sneden, C.
Affiliation:
AA(National Optical Astronomy Observatories; and Bates College, Department of Physics and Astronomy, Box 628, Lewiston, ME 04240; ), AB(National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726-6732 , , ), AC(National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726-6732 , , ), AD(National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726-6732 , , ), AE(McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712; )
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 764, pp. 1233-1247. (PASP Homepage)
Publication Date:
10/1999
Origin:
UCP
PASP Keywords:
STARS: BINARIES: SPECTROSCOPIC, STARS: VARIABLES: GENERAL, GALAXY: GLOBULAR CLUSTERS: INDIVIDUAL: MESSIER NUMBER: M3, GLOBULAR CLUSTERS: INDIVIDUAL (M13, M15), GALAXY: GLOBULAR CLUSTERS: INDIVIDUAL: MESSIER NUMBER: M92
DOI:
10.1086/316439
Bibliographic Code:
1999PASP..111.1233S

Abstract

We report radial velocities for 303 giant stars in the globular clusters M3, M13, M15, and M92. Spectra were obtained using the 4 m Mayall and 3.5 m WIYN telescopes and the Hydra fiber positioner between 1993 and 1997; most spectra were provided by the NOAO WIYN Queue Program. Observations spanned times from a few days to several months. The uncertainties in the velocity measurements are typically 1 km s^-1 or less. Several stars show velocity variations which may result from binary companions or atmospheric motions. Mean cluster velocities were measured to be -147.0+/-0.3, -245.5+/-1.0, -106.2+/-0.3, and -120.3+/-0.3 km s^-1, for M3, M13, M15, and M92, respectively. Radial velocity observations for the photometric variable V73 (vZ 1406) in M3 confirm that the star varies with a period of 0.67 days.

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