Infrared observations of 1612 MHz IR/OH sources.
Infrared spectra and photometry are given for several infrared objects which are known to have 1612 MHz OH eniission. These IR/OH sources are shown to be either M type Mira variables or M supergiants with photo- spheric temperatures around 2000 0K. All those examined are oxygen rich and none are carbon stars which suggests a high abundance of OH in their photospheres. A significant fraction of the total luminosity is emitted in the infrared beyond 3.5 which is taken to imply a dust shell structure around the central star. There is no evidence which uniquely requires that infrared pumping of the OH maser is taking place; there are, however, generally enough near infrared photons to supply the observed microwave energy. Key words: infrared stars - OH emission
Astronomy and Astrophysics
- Pub Date:
- January 1972