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We present a deep imaging and spectroscopic survey of the Local Groupirregular galaxy IC10 using Gemini North and GMOS to unveil its globalWolf-Rayet (WR) population. We obtain a star formation rate (SFR) of 0.045 +/-0.023 Msun/yr, for IC10 from the nebular Halpha luminosity, which is comparableto the SMC. We also present a revised nebular oxygen abundance of log(O/H) + 12= 8.40 +/- 0.04, comparable to the LMC. It has previously been suggested thatfor IC10 to follow the WR subtype-metallicity dependance seen in other LocalGroup galaxies, a large WN population awaits discovery. Our search revealed 3new WN stars, and 6 candidates awaiting confirmation, providing little evidenceto support this claim. The new global WR star total of 29 stars is consistentwith the LMC population when scaled to the reduced SFR of IC10. Forspectroscopically confirmed WR stars, the WC/WN ratio is lowered to 1.0,however including all potential candidates, and assuming those unconfirmed tobe WN stars, would reduce the ratio to ~0.7. We attribute the high WC/WN ratioto the high star formation surface density of IC10 relative to the MagellanicClouds, which enhances the frequency of high mass stars capable of producing WCstars.

Revealing the nebular properties and Wolf-Rayet population of IC10 with Gemini/GMOS