IAR   05382
INSTITUTO ARGENTINO DE RADIOASTRONOMIA
Unidad Ejecutora - UE
artículos
Título:
Multifrequency study of the ring nebula SG 13
Autor/es:
VASQUEZ, J.; CAPPA, C.E.; PINEAULT, S.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Referencias:
Año: 2008
ISSN:
0035-8711
Resumen:
We  investigate the morphology and kinematics of the interstellar medium in the environs of the open cluster Mrk\,50, which includes the Wolf-Rayet star WR\,157  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 $^{12}$CO(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 SG\,13, 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 Mrk\,50 is compatible with a stellar wind bubble created by the mass loss from WR\,157.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.