Journal Article

Multiwavelength study of M33's giant H <span class="smallCaps">ii</span> regions NGC 588 and NGC 592

Leonardo Úbeda and Laurent Drissen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 4, pages 1847-1856
Published in print April 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI:
Multiwavelength study of M33's giant H ii regions NGC 588 and NGC 592

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We present a detailed multiwavelength photometric study of giant H ii regions NGC 592 and NGC 588 in the nearby small spiral galaxy M33. We use data taken with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST). We detect several massive stars in both ionizing clusters. Six Wolf–Rayet (WR) stars are known to exist within those regions and we are able to constrain their physical properties by comparing their photometry to the latest grid of model atmospheres for WR stars of the nitrogen sequence (WN subclass). We estimate the age and mass of both regions by fitting our photometry to models of integrated stellar populations.

Keywords: techniques: photometric; stars: evolution; Hertzsprung–Russell (HR) diagram; stars: Wolf–Rayet; galaxies: individual: M33

Journal Article.  7766 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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