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Astron. Astrophys. 331, 541-549 (1998)

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The luminosity and mass function
of the globular cluster NGC 1261 *

M. Zoccali 1, G. Piotto 1, S.R. Zaggia 2 and M. Capaccioli 2

1 Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
2 Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy

Received 6 October 1997 / Accepted 13 November 1997

Abstract

I-band CCD images of two large regions of the Galactic globular cluster NGC 1261 have been used to construct stellar luminosity functions (LF) for 14000 stars in three annuli from [FORMULA] from the cluster center to the tidal radius. The LFs extend to [FORMULA] and tend to steepen from the inner to the outer annulus, in agreement with the predictions of the multimass King-Michie model that we have calculated for this cluster. The LFs have been transformed into mass functions. Once corrected for mass segregation the global mass function of NGC 1261 has a slope [FORMULA]

Key words: star cluster: globular – stars: luminosity function, mass function

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

Send offprint requests to: M. Zoccali, (zoccali@astrpd.pd.astro.it)

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© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998
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