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Gemini observations of Wolf-Rayet Stars in the Local Group Starburst Galaxy IC10 | | P.A. Crowther L. Drissen
; J.B. Abbott
; P. Royer
; S.J. Smartt
; | | Date: |
24 Feb 2003 | | Journal: | Astron.Astrophys. 404 (2003) 483-494 | | Subject: | astro-ph | | Affiliation: | UCL) L. Drissen (Laval), J.B. Abbott (UCL), P. Royer (Leuven), S.J. Smartt (IoA | | Abstract: | We present Gemini-N GMOS and CFHT MOS spectroscopy of Wolf-Rayet candidates in the Local Group dwarf galaxy IC10 that were previously identified by Massey et al. and Royer et al. From the present spectroscopic survey, the WC/WN ratio for IC10 remains unusually high, given its low metallicity, although none of the WC9 stars suspected from narrow-band imaging are confirmed. Our spectroscopy confirms 9 newly discovered Wolf-Rayet candidates from Royer et al., whilst spectral types of 14 Wolf-Rayet stars previously observed by Massey & Armandroff are refined here. In total, there are 26 spectroscopically confirmed Wolf-Rayet stars in IC~10. All but one of the fourteen WC stars are WC4-6 stars, the exception being # 10 from Massey et al., a broad-lined, apparently single WC7 star. There are a total of eleven WN stars, which are predominantly early WN3-4 stars, but include a rare WN10 star, #8 from Royer et al. #5 from Massey et al. is newly identified as a transition WN/C star. Consequently, the WC/WN ratio for IC10 is 14/11=1.3, unusually high for a metal-poor galaxy. Re-evaluating recent photometric data of Massey & Holmes, we suggest that the true WC/WN ratio may not be as low as 0.3. Finally, we present ground-based finding charts for all confirmed WR stars, plus HST/WFPC2 charts for twelve cases. | | Source: | arXiv, astro-ph/0302475 | | Services: | Forum | Review | PDF | Favorites | |
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