CCD Photometry of M92

Details CCD Photometry of M92 CCD Photometry of M92

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rmxaa..41..507r&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 41, pp. 507-522 (2005) (http://www.astroscu.unam.mx/~rmaa/)

Astronomy and Astrophysics

Astronomy

3

Galaxy: Halo, Globular Clusters: Individual (Ngc 6341), Techniques: Photometric

Scientific paper

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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