Wolf-Rayet (WR) stars are the evolved descendants of massive O-type stars and are considered to be progenitor candidates for Type Ib/c core-collapse supernovae (SNe). Recent results of our HST/WFC3 survey of Wolf-Rayet stars in M101 are summarised based on the detection efficiency of narrow-band optical imaging compared to broad-band methods. We show that on average 42% of WR stars, increasing to ~85% in central regions, are only detected in the narrow-band imaging. Hence, the non-detection of a WR star at the location of ~10 Type Ib/c SNe in broad-band imaging is no longer strong evidence for a non-WR progenitor channel.
Death of Massive Stars: Supernovae and Gamma-Ray Bursts
- Pub Date:
- September 2012
- stars: Wolf-Rayet;
- galaxies: M101;
- Astrophysics - Solar and Stellar Astrophysics
- 4 pages, 2 figures, to appear in Proceedings of IAU 279 "Death of Massive Stars: Supernovae and Gamma-ray Bursts"