HST color-magnitude diagrams of 74 galactic globular clusters in the HST and bands

Free access article

Issue		A&A Volume 391, Number 3, September I 2002


Page(s)		945 - 965
Section		Stellar clusters and associations
DOI		http://dx.doi.org/10.1051/0004-6361:20020820

A&A 391, 945-965 (2002)
DOI: 10.1051/0004-6361:20020820

HST color-magnitude diagrams of 74 galactic globular clusters in the HST ${\vec {F439W}}$ and ${\vec{F555W}}$ bands

G. Piotto¹, I. R. King², S. G. Djorgovski³, C. Sosin², M. Zoccali⁴, I. Saviane⁵, F. De Angeli^{1, 2}, M. Riello^{1, 6}, A. Recio Blanco¹, R. M. Rich⁷, G. Meylan⁸ and A. Renzini⁴

¹ Dipartimento di Astronomia - Università di Padova, 35122 Padova, Italy
    e-mail: piotto@pd.astro.it; deangeli@pd.astro.it; recio@pd.astro.it
² Astronomy Department, University of California, Berkeley, CA 94720, USA
    e-mail: king@glob.berkeley.edu; craig@sosin.org
³ California Institute of Technology, MS 105-24, Pasadena, CA 91125, USA
    e-mail: george@deimos.caltech
⁴ European Southern Observatory, 85748 Garching bei Munich, Germany
    e-mail: mzoccali@eso.org; gmeylan@eso.org; arenzini@eso.org
⁵ European Southern Observatory, Casilla 19001, Santiago, Chile
⁶ Osservatorio Astronomico, 35122 Padova, Italy
    e-mail: riello@pd.astro.it
⁷ Physics and Astronomy Department, University of California, Los Angeles, CA 90024, USA
    e-mail: rmr@astro.ucla.edu
⁸ Space Telescope Science Institute, Baltimore, MD 21218, USA

(Received 3 April 2002 / Accepted 30 May 2002 )

Abstract
We present the complete photometric database and the color-magnitude diagrams for 74 Galactic globular clusters observed with the HST/WFPC2 camera in the F439W and F555W bands. A detailed discussion of the various reduction steps is also presented, and of the procedures to transform instrumental magnitudes into both the HST F439W and F555W flight system and the standard Johnson B and V systems. We also describe the artificial star experiments which have been performed to derive the star count completeness in all the relevant branches of the color magnitude diagram. The entire photometric database and the completeness function will be made available on the Web immediately after the publication of the present paper.

Key words: stars: evolution -- stars: C-M diagrams -- stars: Population II -- Galaxy: globular clusters: general

Offprint request: G. Piotto, piotto@pd.astro.it

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