The radio and IR counterparts of the ring nebula around HD211564

TL;DR

This study identifies and analyzes the radio and infrared counterparts of the ring nebula around HD211564, revealing its structure, composition, and origin from stellar winds, with detailed measurements of gas and dust properties.

Contribution

First detailed multi-wavelength analysis of the nebula around HD211564, linking radio, infrared, and HI data to understand its structure and origin.

Findings

Detected two concentric radio rings related to HD211564.

Measured electron densities and ionized masses of the nebula.

Identified neutral atomic gas and small molecular clumps associated with the nebula.

Abstract

We report the detection of the radio and infrared counterparts of the ring nebula around the WN3(h) star HD211564 (WR152), located to the southwest 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' 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 450-700 Mo, respectively. The analysis of the HI gas emission distribution allowed the identification of 5900 Mo of neutral atomic gas with velocities between -52 and -43 km/s 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 Mo. About 310 Mo 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 30, -0 50), of about 31 pc in radius. The bubble's energy conversion efficiency is in agreement with recent numerical analysis and with observational results.