CCD Photometry of the Classic Second Parameter Globular Clusters M3 and M13

Details CCD Photometry of the Classic Second Parameter Globular Clusters M3 and M13 CCD Photometry of the Classic Second Parameter Globular Clusters M3 and M13

2001-09-13

arxiv.org/abs/astro-ph/0109203v1

Astronomy and Astrophysics

Astrophysics

27 pages, 12 figures, Accepted for publication in AJ

Scientific paper

10.1086/324104

We present high-precision V, B-V color-magnitude diagrams (CMDs) for the classic second parameter globular clusters M3 and M13 from wide-field deep CCD photometry. The data for the two clusters were obtained during the same photometric nights with the same instrument, allowing us to determine accurate relative ages. Based on a differential comparison of the CMDs using the Delta (B-V) method, an age difference of 1.7 +/- 0.7 Gyr is obtained between these two clusters. We compare this result with our updated horizontal-branch (HB) population models, which confirm that the observed age difference can produce the difference in HB morphology between the clusters. This provides further evidence that age is the dominant second parameter that influences HB morphology.

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