CCD Photometry of Intermediate Age Open Cluster M11. I. Statistical Analysis

Details CCD Photometry of Intermediate Age Open Cluster M11. I. Statistical Analysis CCD Photometry of Intermediate Age Open Cluster M11. I. Statistical Analysis

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jkas...29..269s&link_type=abstract

Journal of the Korean Astronomical Society, vol. 29, no. 2, p. 269-278

Astronomy and Astrophysics

Astronomy

3

Cluster: Open, Surface Density: Luminosity Function, Mass Segregation

Scientific paper

We present the color-magnitude diagrams(CMD) of more than 24,000 stars in the field of an intermediate age open cluster M11, based on wide field CCD imaging. The morphology of the CMDs varies strikingly as the distance from the center of the cluster increases. From the surface number density analysis, we confirm the mass segregation effect in this cluster: the bright, massive stars are centrally more concentrated than the faint, low mass stars. The slope of field-corrected surface density with respect to magnitude progressively increases as the radius increases, up to r=5'. Most of the field stars in or near the cluster main sequence band and in the bright part of the red stars in the CMDs appear to be nearly at the same distance as M11, and they are considered to be the major component of disk stars in the Sagittarius-Carina arm.

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