Journal Article

Wolf–Rayet stars in M33 – II. Optical spectroscopy of emission-line stars in giant H <span class="smallCaps">ii</span> regions

Laurent Drissen, Paul A. Crowther, Leonardo Úbeda and Pierre Martin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 3, pages 1033-1040
Published in print September 2008 | ISSN: 0035-8711
Published online September 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13633.x
Wolf–Rayet stars in M33 – II. Optical spectroscopy of emission-line stars in giant H ii regions

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We present optical spectra of 14 emission-line stars in M33's giant H ii regions NGC 592, 595 and 604: five of them are known Wolf–Rayet (WR) stars, for which we present a better quality spectrogram, eight are WR candidates based on narrow-band imagery and one is a serendipitous discovery. Spectroscopy confirms the power of interference filter imagery to detect emission-line stars down to an equivalent width of about 5 Å in crowded fields. We have also used archival Hubble Space Telescope (HST)/WFPC2 (Wide Field and Planetary Camera 2) images to correctly identify emission-line stars in NGC 592 and 588.

Keywords: stars: Wolf–Rayet; galaxies: individual: M33; Local Group

Journal Article.  4354 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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