Star cluster detection with WFC/ACS in M 33

33 new clusters and 51 candidates

¹ European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748, Garching, Germany e-mail: lbedin@eso.org
² Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, Padova 35122, Italy e-mail: [piotto,momany,ortolani]@pd.astro.it
³ Facultad de Ciencias Astronómicas y Geofísicas de la UNLP, IALP-CONICET, Paseo del Bosque s/n, La Plata, Argentina e-mail: gbaume@fcaglp.fcaglp.unlp.edu.ar
⁴ Andes Fellow, Departamento de Astronómia, Universidad de Chile, Casilla 36-D, Santiago, Chile e-mail: gcarraro@das.uchile.cl
⁵ Department of Physics and Astronomy, Mail Stop 108, Rice University, 6100 Main Street, Houston, TX 77005, USA e-mail: jay@eeyore.rice.edu

Received: 27 June 2005
Accepted: 19 August 2005

Abstract

In this work we present the detection of 33 star clusters and 51 candidates in one field of the near by galaxy M 33. This study is based on WFC/ACS images available from the HST archive. Thanks to the high resolving power, we were able to confirm that two candidates previously indicated by Christian & Schommer (1982, ApJS, 49, 405) are indeed star clusters. We list the main properties for the star clusters (and candidates), along with some peculiar objects, such as background galaxies and possible HII regions.