The radio and IR counterparts of the ring nebula around HD211564

C.E. CAPPA; J. VASQUEZ; S. PINEAULT; S. CICHOWOLSKI

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2009

0035-8711

We report the detection of the radio and infrared counterparts ofthe ring nebula around the WN3(h) star HD 211564 (WR 152), located to the southwest of the \hii\ region Sh2-132. Using radio continuum data from the Canadian Galactic Plane Survey, we identified the radio counterparts of the two concentric rings, of about 9\arcmin\  and 16\arcmin\ in radius, related to the star. After applying a filling factor $f$ = 0.05-0.12, electron densities and ionized masses are in the range 10-16 \cmtres\ and 450-700 \msun, respectively. The analysis of the \hi\ gas emission distribution allowed the identification of 5900 \msun\ of neutral atomic gas with velocities between --52 and  --43 \kms\ probably linked to the nebula.The region of the nebula is almost free of molecular gas. Only four small clumps were detected, with a total molecular mass of 790 \msun. About 310 \msun\are related to a small infrared shell-like source linked to the inner ring, which is also detected in the MSX band A. An IRAS YSO candidate is detected in coincidence with the shell-like IR source.We suggest that the optical nebula and its neutral counterparts originated from the stellar winds from the WR star and its massive progenitor, and are evolving in the envelope of a slowly expanding shell centered at $(l,b)$ = (102\fdg 30, --0\fdg 50), of about 31 pc in radius. The bubble's energy conversion efficiency is in agreement with recent numerical analysis and with observational results.