Article ID: gc419
Author	Sandage, A. R.
Title	The color-magnitude diagram for the globular cluster M 3.
Journal	Astronomical Journal, Vol. 58, p. 61-75
Year of publication	1953 (on gclusters from 2013-12-04 10:29:44 )
Abstract	Colors and magnitudes for 1100 stars in M3 have been derived from a combination of photographic and photoelectric techniques. The resulting color-magnitude diagram is qualitatively similar to that of M92 but significant differences are noted. Comparison of the diagram for populations Type I and Type II indicates that the M3 data are not inconsistent with a value of Mv=0.00 for the mean absolute magnitude of the cluster-type Cepheids. The application of an evolutionary theory to the M3 and M92 data gives a time interval of 5 x 10^9 years since the formation of the main sequence in these clusters. This may be considered as a measure of the age of globular clusters.
CM diagram
Tags	NGC 5272 , NGC 5904

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