Radio and infrared observations of the HII complex BG 2107+49.
Abstract
The nature of the H II complex BG 107 + 49 is investigated using results of high-resolution radio observations (in the radio continuum at 74 and 21 cm and in the 21-cm H I line) and broad IR maps of BG 2107 + 49, obtained by the IRAS satellite. In addition, H112-alpha spectra were obtained at various positions in the complex. It was found that both the 'head' and the 'tail' components of the complex have a recombination line velocity V(LSR) of -80 km/sec (and are, most likely, physically associated), while the southern continuum feature of the complex is at -64 km/sec. Evidence is presented for a partial shell of H I being associated with the complex, with a systemic velocity of -80 km/sec, an expansion velocity of 24 km/s, and a diameter of 150 pc. It is suggested that this shell, together with the curved ionized tail component of the BG 2107 + 49 complex are part of a swept-up stellar wind shell with a mass of at least 120,000 and an age of 1.9 x 10 to the 6th yrs.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1990
- Bibcode:
- 1990A&A...235..407V
- Keywords:
-
- H Ii Regions;
- Infrared Astronomy Satellite;
- Infrared Radiation;
- Interstellar Matter;
- Radio Sources (Astronomy);
- Astronomical Spectroscopy;
- Carbon Monoxide;
- Emission Spectra;
- Galactic Structure;
- Molecular Clouds;
- Stellar Winds;
- Astrophysics