Color Distributions of 29 Galactic Globular Clusters

Details Color Distributions of 29 Galactic Globular Clusters Color Distributions of 29 Galactic Globular Clusters

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jass...15....1s&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 15, no. 1, p. 1-26.

Astronomy and Astrophysics

Astronomy

5

Scientific paper

U, B, and V CCD images are used to investigate the radial color gradients of twenty nine Galactic globular clusters - twenty two King type clusters and seven Post Core Collapse (PCC) clusters classified on their surface brightness distributions. For King type clusters, eight clusters show radial color gradients with redder center and seven clusters with bluer centers in (B-V). Seven King type clusters have redder centers in (U-B), and five King type clusters show radial color gradients with bluer center in the same color. Among seven PCC clusters, one cluster show a redder center and five clusters show bluer centers in (B-V). Two PCC clusters have redder centers in (U-B), four PCC clusters show radial color gradients with bluer centers in the same color. These results bring an evidence that the color gradient is not unique to PCC clusters with bluer center. >From the Pearson's correlation coefficient tests, we found the horizontal branch morphologies have weak correlations to the radial color gradients within globular clusters.

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