Aperture synthesis observations of galactic H II regions. VIII. S106 and S235: regions of star formation.
Abstract
Summary. We observed the peculiar emission nebulae 5106 (Mt-19) and S235 (M1-82) with the Westerbork Synthesis Radio Telescope at frequencies of 5.0 and 1.4 GHz. Our analysis indicates that S106 consists of two different ionization front structures, and two (possibly three) obscured compact components. The area around S235, which contains also the nebulosities S231, S232 and S233, is studied. The identification of the radio sources is obtained taking also into account lower resolution observations. Values for the parameters of the identified H Ii regions are given. S235 itself is a well- evolved, almost featureless radio nebula at a resolution of 24". In its vicinity a compact H II region is found. Associated with the same CO cloud as the main nebula and the compact source another small H ii region has been detected. The infrared object Mt-82 1 has no radio counterpart stronger than 5 m.f.u. at 5 GHz. Key words: aperture synthesis - radio observations H II regions star formation
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1978
- Bibcode:
- 1978A&A....63..325I
- Keywords:
-
- Galactic Radiation;
- H Ii Regions;
- Nebulae;
- Protostars;
- Star Formation;
- Astronomical Maps;
- Carbon Monoxide;
- Gas Ionization;
- Hydrogen Ions;
- Radio Astronomy;
- Stellar Evolution;
- Astronomy;
- H II Regions:Radio Maps;
- H II Regions:Star Formation