CCD Photometry of M92

Ruelas-Mayorga A.; Sánchez L. J.

Vol. 41 No. 2 (2005), Research articles

Vol. 41 No. 2 (2005)

Research articles

CCD Photometry of M92

Published 2005-10-01

Ruelas-Mayorga A.⁺⁻
Sánchez L. J.⁺⁻

Ruelas-Mayorga A.

Instituto de Astronomía, Universidad Nacional Autónoma de México, México

Sánchez L. J.

-

https://orcid.org/0000-0001-9637-7774

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Keywords

Galaxy: Halo
Globular Clusters: Individual (NGC 6341)
Techniques: Photometric

How to Cite

CCD Photometry of M92. (2005). Revista Mexicana De Astronomía Y Astrofísica, 41(2), 507-522. https://astronomia.unam.mx/journals/rmxaa/article/view/2005rmxaa..41..507r

Abstract

We present Johnson B and V photometry for the galactic globular cluster M92 (NGC 6341). Photometric results for a total of ∼ 30,000 stars are obtained and are plotted on a V versus (B-V) diagram. We fit theoretical isochrones to this diagram in order to get an estimate for the age of M92. The age which we find is ∼ 16×10⁹ years with the following values for the metallicity and He-abundance: [Fe/H] = -2.03, Y = 0.235. The distance modulus to this cluster turns out to be m - M = 14.6 in accordance with that obtained by Stetson & Harris (1988). We also perform stellar counts in order to produce a luminosity function which is successfully fitted by the same theoretical models fitted to the colour-magnitude diagram.

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CCD Photometry of M92

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