SED, Metallicity and Age of Halo Globular Clusters in M33

Details SED, Metallicity and Age of Halo Globular Clusters in M33 SED, Metallicity and Age of Halo Globular Clusters in M33

2002-01-28

arxiv.org/abs/astro-ph/0201442v1

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures, has been accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20020141

In this paper we study the properties of ten halo globular clusters in the nearby spiral galaxy M33. CCD images of M33 were obtained as a part of the BATC Colour Survey of the sky in 13 intermediate-band filters from 3800 to 10000{\AA}. By aperture photometry, we obtain the spectral energy distributions (SEDs) of these globular clusters. We estimate the ages of our sample clusters by comparing the photometry of each object with theoretical stellar population synthesis models for different values of metallicity. Our results suggest that eight of the ten sample halo globular clusters have ``intermediate'' ages, i.e. between 1 and 8 Gyrs.

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