AAS 207th Meeting, 8-12 January 2006
Session 128 (Extra) Galactic Globular Clusters
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[128.02] Combined Photometry and Spectroscopy of Globular Cluster Tidal Streams

W. L. Powell, R. Wilhelm (Texas Tech), A. McWilliam (Carnegie Observatories), A. Westfall, A. Lauchner (Texas Tech)

Globular cluster tidal streams are of interest for what they can tell us of the dynamical evolution of the clusters and our Galaxy. Recent studies have used photometric and statistical subtraction methods to attempt to separate potential streams from the field stars that contaminate the samples. We chose instead to use photometry to select blue stars that match the horizontal branch of the clusters and make spectroscopic observations of these candidates to determine their metallicity and radial velocities. Combining these results with the photometric data offers a better picture of the structure and formation of tidal streams. We present preliminary photometric and spectroscopic results for the globular clusters and surrounding fields of NGC 6934, M 10, M 92 and Pal 13. Data obtained at McDonald Observatory, Kitt Peak, and Las Campanas Observatory.

WLP acknowledges the support of a Sigma Xi Grant-In-Aid of research, and the Texas Space Grant Consortium Graduate Fellowship. RW acknowledges the support of a AAS Small Research Grant.

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