Wolf-Rayet Stars in M33 II: Optical Spectroscopy of emission-line stars in Giant Hii Regions

Abstract

We present optical spectra of 14 emission-line stars in M33s giant HII regions NGC 592, NGC 595 and NGC 604: five of them are known WR stars, for which we present a better quality spectrogram, eight were 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 A in crowded fields. We have also used archival HST/WFPC2 images to correctly identify emission-line stars in NGC 592 and NGC 588. emission-line stars in NGC 592 and NGC 588.

arXiv comment9 pages, 14 figures, revised version submitted to MNRAS

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• HST/COS Observations of Ionized Gas Accretion at the Disk-halo Interface of M33
• The red supergiants & Wolf-Rayet stars of NGC 604
• A 2D multiwavelength study of the ionized gas and stellar population in the Giant HII Region NGC 588
• Inferring the presence of very massive stars in local star-forming regions
• Core-collapse supernova progenitor constraints using the spatial distributions of massive stars in local galaxies
• First survey of Wolf-Rayet star populations over the full extension of nearby galaxies observed with CALIFA
• Dust Properties in HII Regions in M33
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• A photoionization model of the spatial distribution of the optical and mid-IR properties in NGC595
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• Unveiling the new generation of stars in NGC 604 with Gemini-NIRI
• The First Candidate Colliding-Wind Binary in M33
• A Spectroscopic Search for High Mass X-ray Binaries in M31
• SIGNALS of Giant HII Regions: A Spatially Resolved Analysis of NGC 604
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