JHK photometry of bright giants in M69

Details JHK photometry of bright giants in M69 JHK photometry of bright giants in M69

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1720d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, May 1991, p. 1720-1734.

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22

Astronomical Photometry, Giant Stars, Globular Clusters, Color-Color Diagram, Color-Magnitude Diagram, Infrared Photometry, Interstellar Extinction

Scientific paper

Broadband NIR photometric measurements of bright giants in the metal-rich globular cluster M69 are discussed. Two fields were observed: one centered on the cluster nucleus, the other offset 50 arcsec north. Numerical experiments indicate that the internal accuracy of the present photometry is comparable to that which can be achieved at optical wavelengths with CCD detectors. If the horizontal branches of M69 and 47 Tuc are assumed to have similar intrinsic brightnesses at NIR wavelengths, then the difference in distance moduli between the two clusters is about 1.4, rather than about 1.7 inferred from earlier optical work. Based on this result, as well as the location of M69 stars in the (J-K, V-K) two-color and (K, V-K) color-magnitude diagrams, it is suggested that earlier V measurements of M69 stars near the level of the horizontal branch are about 0.3 mag too faint.

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