Infrared observations of compact H II regions in the spectral range 3.4 - 33 micrometers. (original) (raw)
NASA/ADS
Abstract
We have obtained photometry of 17 compact infrared sources in five galactic H ii regions (W3, W33, W48, WSl, and W7S) in the spectral range from 3.4 to 33 m. We find: (1) flux spectra that continue to rise at wavelengths beyond 20 m for many objects; (2) luminosities that are considerably higher than estimates based on data extending to 20 m; and (3) complex behavior in the spectra between 20 and 33 m that is not simply related to the depth of the 10 m silicate absorption. A cluster of three luminous infrared sources has been discovered coincident with the compact radio source in W33. Infrared emission has also been found associated with the maser source W33 A and with W3(D). Subject headings: infrared: sources - nebulae: general - stars: -sequence
Publication:
The Astrophysical Journal
Pub Date:
January 1977
DOI:
Bibcode:
Keywords:
- H Ii Regions;
- Infrared Spectra;
- Interstellar Masers;
- Nebulae;
- Stellar Evolution;
- Astronomical Photometry;
- Hydrogen Ions;
- Infrared Radiation;
- Main Sequence Stars;
- Stellar Luminosity;
- Astrophysics