Young Galactic globular clusters II. The case of Palomar 12

Details Young Galactic globular clusters II. The case of Palomar 12 Young Galactic globular clusters II. The case of Palomar 12

1998-09-09

arxiv.org/abs/astro-ph/9809112v1

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures, to be published in Astronomy & Astrophysics, vol. 339

Scientific paper

We present broadband V,I CCD photometry for ca. 1700 stars towards the Galactic globular cluster Palomar 12, covering a field of 10.7' x 10.7'. From these data, a color-magnitude diagram from the red giant branch tip to ca. 2 mag below the cluster's turn-off is obtained. From a comparison with the color magnitude diagrams of 47 Tuc and M5, and using different theoretical models, we confirm that Pal 12 is younger, finding an age 68% +/- 10% that of both template clusters. Revised structural parameters are also obtained: r(c) = 37.8 +/- 0.6 and c = 1.08 +/- 0.02.

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