Sh2-205: three HII regions or only one?

ROMERO, G.A.; CAPPA, C.E.

Malargüe, Mendoza

Congreso; 50a. Reunión de la asoc. Arg. de Astronomía; 2007

Asoc. Argentina de Astronomía

We present a study of the HII region Sh2-205 and its environs, based on data obtained from the CGPS, CO observations, and MSX data. We find that Sh2-205 can be separated in three independent optical structures:SH 149.25-0.0, SH148.83-0.67, and LBN148.11-0.45. The derived spectral indices show the thermal nature of SH149.83-0.67 and LBN149.11-0.45. The morphology of SH148.83-0.67, both in the optical and radio emissions, along with the energetic requirements indicate that this feature is an interstellar bubble powered by the UV photons of HD24431 (O9III). LBN148.11-0.45 has the morphology of a classical HII region and their ionizing sources remain uncertain. Dust and molecular gas  are found related to LBN148.11-0.45. Particularly, a photodissociation region is detected surrounding the central part of this HII region at infrared wavelengths.