Multifrequency study of the ring nebula SG13

TL;DR

This study combines multiwavelength observations to analyze the morphology, kinematics, and physical properties of the ring nebula SG13 and its surrounding interstellar medium, revealing dust, gas dynamics, and potential star formation activity.

Contribution

It provides a comprehensive multiwavelength analysis of SG13, identifying its molecular and dust components and linking them to stellar wind activity and star formation.

Findings

SG13 is associated with radio continuum and molecular gas, but not neutral atomic gas.

Dust is present within the nebula, mixed with ionized gas.

Evidence suggests stellar wind from WR157 influences the nebula and possibly triggers star formation.

Abstract

We investigate the morphology and kinematics of the interstellar medium in the environs of the open cluster Mrk50, which includes the Wolf-Rayet star WR157 and a number of early B-type stars. The analysis was performed using radio continuum images at 408 and 1420 MHz, and HI 21cm line data taken from the Canadian Galactic Plane Survey, molecular observations of the 12CO (J=1-0) line at 115 GHz from the Five College Radio Astronomy Observatory and available mid and far IR observations obtained with the MSX and IRAS satellites, respectively. This study allowed identification of the radio continuum and molecular counterpart of the ring nebula SG13, while no neutral atomic structure was found to be associated. The nebula is also detected in images in the mid and far infrared, showing the existence of dust well mixed with the ionized gas. We estimate the main physical parameters of the material linked to the nebula. The interstellar gas distribution in the environs of Mrk50 is compatible with a stellar wind bubble created by the mass loss from WR157. The distribution of young stellar object (YSO) candidates in the region shows that stellar formation activity may be present in the molecular shell that encircles the ring nebula.