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Astron. Astrophys. 339, 61-69 (1998)

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

A. Rosenberg 1, I. Saviane 2, G. Piotto 2 and E.V. Held 3

1 Telescopio Nazionale Galileo, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
2 Dipartimento di Astronomia, Univ. di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
3 Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy

Received 29 May 1998 / Accepted 12 August 1998

Abstract

We present broadband V,I CCD photometry for [FORMULA] stars towards the Galactic globular cluster Palomar 12, covering a field of [FORMULA]. From these data, a color-magnitude diagram from the red giant branch tip to [FORMULA] 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 [FORMULA] that of both template clusters. Revised structural parameters are also obtained: [FORMULA] and [FORMULA].

Key words: Hertzsprung-Russell (HR) diagram – stars: Population II – globular clusters: individual: Palomar 12

* Based on data collected at the European Southern Observatory, La Silla, Chile

Send offprint requests to: A. Rosenberg, (alf@obelix.pd.astro.it)

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© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998
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