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Keywords

Galaxy: halo
globular clusters: general
globular clusters: individual (M92)
stars: evolution
techniques: photometric

How to Cite

CCD Photometry of M92. (2008). Revista Mexicana De Astrofísica Y Astronomía Serie De Conferencias, 34(1), 137-138. https://astronomia.unam.mx/journals/rmxac/article/view/2008rmxac..34..137r
hola

Abstract

We present Johnson B and V photometry for the galactic globular cluster M92. Photometric results for a total of ~30000 stars are obtained and are plotted on a V vs (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 ~16×10^9 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).