The radio and infrared counterparts of the ring nebula around HD211564

CAPPA CRISTINA E.; VASQUEZ JAVIER; PINEAULT SERGE; CICHOWOLSKI SILVINA

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2010 vol. 403 p. 387 - 397

0035-8711

ABSTRACT We report the detection of the radio and infrared (IR) counterparts of the ring nebula around the WN3(h) star HD211564 (WR152), located to the south-west of the HII region Sh2132. Using radio continuum data from the Canadian Galactic Plane Survey, we identified the radio counterparts of the two concentric rings, of about 9 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 cm-3 and 450-700Msolar, respectively. The analysis of the HI gas emission distribution allowed the identification of 5900Msolar of neutral atomic gas with velocities between -52 and -43kms-1 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 790Msolar. About 310 Msolar are related to a small IR shell-like source linked to the inner ring, which is also detected in the MSX band A. An IRAS young stellar object 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 Wolf-Rayet star and its massive progenitor, and are evolving in the envelope of a slowly expanding shell centred at of about 31 pc in radius. The bubble´s energy conversion efficiency is in agreement with recent numerical analysis and with observational results.