CCD photometry of M92
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 x 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). 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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| Main Authors: | , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Universidad Nacional Autónoma de México, Instituto de Astronomía
2005
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0185-11012005000200015 |
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