Wolf–Rayet stars in M33 – I. Optical spectroscopy using CFHT-MOS
Corresponding Author
Jay B. Abbott
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
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Paul A. Crowther
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT
Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
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Laurent Drissen
Département de Physique, Université Laval, Québec City G1K 7P4, Québec, Canada
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
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Luc Dessart
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
Search for more papers by this authorPierre Martin
Canada–France–Hawaii Telescope, 65-1238 Mamalahoa Hwy, HI 96743, USA
Search for more papers by this authorGuillaume Boivin
Département de Physique, Université Laval, Québec City G1K 7P4, Québec, Canada
Search for more papers by this authorCorresponding Author
Jay B. Abbott
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
Search for more papers by this authorCorresponding Author
Paul A. Crowther
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT
Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
Search for more papers by this authorCorresponding Author
Laurent Drissen
Département de Physique, Université Laval, Québec City G1K 7P4, Québec, Canada
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
Search for more papers by this authorCorresponding Author
Luc Dessart
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany
★ E-mail: [email protected]
†Visiting Astronomer, Canada–France–Hawaii Telescope.
Search for more papers by this authorPierre Martin
Canada–France–Hawaii Telescope, 65-1238 Mamalahoa Hwy, HI 96743, USA
Search for more papers by this authorGuillaume Boivin
Département de Physique, Université Laval, Québec City G1K 7P4, Québec, Canada
Search for more papers by this authorABSTRACT
We have obtained spectroscopy of a large sample of Wolf–Rayet stars in M33 with the Canada–France–Hawaii Telescope Multi-Object Spectrograph (CFHT-MOS), including 26 WC stars, 15 WN stars and a WN/C star. In general, spectral types are merely refined, although the spectral type of X9 from Massey & Johnson is revised from WNL?+abs to WC4+abs, whilst their G1 and C21 candidates are not confirmed as Wolf–Rayet stars. We also re-examine the metallicity gradient of M33 from H ii regions and identify the present sample, lying in the inner disc, with 8.6 ≤ log(O/H) ≤ 8.9. Spectral types are in accord with similar regions in the Milky Way. Our large sample has allowed us to examine the claimed anticorrelation between WC linewidths and galactocentric distance by Schild et al. We find a much larger scatter, though there remains an absence of broad-line WC stars in the inner disc and narrow-line WC stars in the outer galaxy.
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