Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5810r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.10; Bulletin of the American Astronomical Society, Vol. 39, p.835
Astronomy and Astrophysics
Astronomy
Scientific paper
We have combined 2MASS photometry with published and unpublished Yerkes proper motion data of the globular clusters 47 Tuc, M2, M3, M4, M5, M13, M15, M22, M28, M71, M92, M107, NGC 6397, and NGC 6712, as well as the very old but metal-rich open cluster NGC 6791. The rigorous membership determination from the proper motions has enabled us to produce infrared color-magnitude diagrams (CMDs) of these clusters that are virtually free of field contamination. These are the first infrared CMDs of globular clusters with substantial membership determination by proper motions. The proper-motion cleaned CMDs will be used to calibrate the slope of the Red Giant Branch, a metallicity-sensitive but distance- and reddening-independent parameter, over a range of more than 2.5 dex in [Fe/H]. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the NSF. This research has been partially supported by the NSF.
Cudworth Kyle McC.
Rees Richard F. Jr.
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