HST-WFPC2 Observations of the Star Clusters in the Giant HII Regions of M33

Details HST-WFPC2 Observations of the Star Clusters in the Giant HII Regions of M33 HST-WFPC2 Observations of the Star Clusters in the Giant HII Regions of M33

2001-09-17

arxiv.org/abs/astro-ph/0109258v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, uses IAU207_pasp.sty and psfig.sty To appear in the proceedings of IAU Symp. 207, "Extragalactic Star Clus

Scientific paper

We present a photometric study of the stars in ionizing star clusters embedded in several giant HII regions of M33 (CC93, IC 142, NGC 595, MA2, NGC 604 and NGC 588). Our photometry are based on the HST-WFPC2 images of these clusters. Color-magnitude diagrams and color-color diagrams of these clusters are obtained and are used for estimating the reddenings and ages of the clusters. The luminosity functions (LFs) and initial mass functions (IMFs) of the massive stars in these clusters are also derived. The slopes of the IMFs range from Gamma = -0.5 to -2.1. It is found interestingly that the IMFs get steeper with increasing galactocentric distance and with decreasing [O/H] abundance.

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