Infrared photometry, bolometric luminosities, and effective temperatures for giant stars in 26 globular clusters

Creators: Frogel, Jay A.; Persson, S. E.; Cohen, Judith G.

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Abstract

Infrared observations of 307 giant stars in 26 globular clusters are presented. The effects of H_2O absorption on the infrared colors are examined. The color-color correlations and color-magnitude diagrams, derived using an internally consistent set of distance moduli and reddenings, identify specific clusters with problematical reddenings or low quality optical data. The mean behavior of the color-color relationships is, in all cases, in good agreement with our earlier work.

Additional Information

© American Astronomical Society • Provided by the NASA Astrophysics Data System. Received 1983 February 28; accepted 1983 May 24. Cerro Tololo Inter-American Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under contract AST-78-27879 with the National Science Foundation. J. A. F. would like to thank Marshall Cohen and the Caltech Astronomy Department for their hospitality during a sabbatical leave from CTIO when this paper was written. He also thanks Jay Elias for help in obtaining some of the data presented here. We thank all of the telescope operators and observer support people at the various observatories for assisting in a variety of ways over the course of this long observing program on globular clusters. Ximena Herreros and Marcelo Bass at CTIO patiently typed and photographed the numerous versions of the extensive tabular material contained in this paper.

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