JHK photometry of bright giants in M69
In: The Astronomical journal (New York), Jg. 101 (1991), Heft 5, S. 1720-1734
Online
academicJournal
- print, 1/2 p
Zugriff:
We discuss broadband near-infrared photometric measurements of bright giants in the metal-rich globular cluster M69 (NGC 6637), obtained with the University of Hawaii Institute for Astronomy 256 × 256 infrared camera at the Canada-France-Hawaii Telescope. Two fields were observed : one centered on the cluster nucleus, the other offset 50 arcsec north. Numerical experiments indicate that the internal accuracy of our photometry is comparable to that which can be achieved at optical wavelengths with CCD detectors. Adopting E(B-V) = 0.17, we find that the giant branch locus of M69 agrees well with that of 47 Tuc and, assuming an age of 13 Gyr, a comparison with theoretical isochrones predicts that [Fe/H] ∼ -0.7-0.2+0.1 for both clusters.
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JHK photometry of bright giants in M69
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Autor/in / Beteiligte Person: | DAVIDGE, T. J ; SIMONS, D. A |
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Zeitschrift: | The Astronomical journal (New York), Jg. 101 (1991), Heft 5, S. 1720-1734 |
Veröffentlichung: | Chicago, IL: University of Chicago Press, 1991 |
Medientyp: | academicJournal |
Umfang: | print, 1/2 p |
ISSN: | 0004-6256 (print) |
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