Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2192b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2192-2198, 2372.
Astronomy and Astrophysics
Astronomy
10
Astronomical Photometry, Galactic Clusters, Star Clusters, Charge Coupled Devices, Color-Magnitude Diagram, Stellar Evolution
Scientific paper
We present a deep CCD investigation of stars in a selected region near the center of the galactic cluster M11. The color-magnitude diagram, based on more than 5000 stars, reveals that the cluster main sequence (MS) appears well-populated down to, at least, V about 20.5 and, perhaps, down to the observational limit. Assuming for the cluster E(B-V) = 0.42 mag, the best fit of the MS to Pleiades gives for M11 an apparent distance modulus of 12.5 +/- 0.2 mag, which implies a distance of 1.74 +/- 0.2 kpc. Evidence supports a strong dependence of the cluster luminosity function on the distance from the cluster center. We find that in the observed region the abundance of stars with V = 15 mag or greater appears about 2.5 times larger than previous estimates, following a luminosity function steeper than expected from a Salpeter's mass distribution. By best fitting the luminosity function of H-burning stars to theoretical data, one obtains a good agreement for a cluster age of 150 million years. The various evolutionary phases appear to be populated according to theoretical constraints.
Brocato Enzo
Castellani Vittorio
DiGiorgio Anna
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