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

Published online by Cambridge University Press:  03 August 2017

Myung Gyoon Lee ,
Hong Soo Park ,
Sang Chul Kim ,
William H. Waller ,
Joel Wm. Parker ,
Eliot M. Malumuth  and
Paul W. Hodge
Myung Gyoon Lee
Affiliation:
Astronomy Program, SEES, Seoul National University, Seoul, 151-742, Korea
Hong Soo Park
Affiliation:
Astronomy Program, SEES, Seoul National University, Seoul, 151-742, Korea
Sang Chul Kim
Affiliation:
Astronomy Program, SEES, Seoul National University, Seoul, 151-742, Korea
William H. Waller
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155, USA
Joel Wm. Parker
Affiliation:
Southwest Research Institute, Suite 426, 1050 Walnut Street, Boulder, Colorado 80302, USA
Eliot M. Malumuth
Affiliation:
Raytheon ITSS and Laboratory for Astronomy and Solar Physics, NASA/Goddard Space Flight Center, Code 681, Greenbelt, MD 20771, USA
Paul W. Hodge
Affiliation:
Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580a, USA

Abstract

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We present a photometric study of the stars in ionizing star clusters embedded in several giant H II regions of M33 (CC93, IC 142, NGC 595, MA2, NGC 604 and NGC 588). Our photometry is 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 Γ = −0.5 to −2.1. Interestingly, it is found that the IMFs get steeper with increasing galactocentric distance and with decreasing [O/H] abundance.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 157 - 159
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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