Bibcode
Paez, E.; Martinez Roger, C.; Straniero, O.
Bibliographical reference
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 84, no. 3, Sept. 1990, p. 481-516.
Advertised on:
9
1990
Citations
25
Refereed citations
23
Description
CCD photometry of faint stars in the globular cluster M3 is presented.
The observations reach down to V equal to about 23 mag, with a sample of
approximately 5000 stars. The resulting color magnitude diagram has a
turn-off significantly redder than those obtained in previous studies.
Age and distance are derived by fitting the observed mean line to the
theoretical isochrones by Chieffi and Straniero (1989). The dependence
on the assumed metallicity and color excess values is studied in some
detail. In general, theoretical and observed loci are in excellent
agreement yielding (m-M)v from 14.85 to 14.93 mag) and t from 16 to 19
Gyr, depending on the different assumptions about reddening and
metallicity. Finally, the luminosity function (LF) is presented. When
incompletenesses are taken into account, the observed LF appears in good
agreement with the curve predicted by theoretical models computed
assuming a mass function with alpha = 2.5.