The Radio Components of IC 1795.
Abstract
University of Toronto.-Studies of the radio structure of I C 1795 (W3) at wavelengths of 2.8, 4.5, and 9.3 cm with the 150-ft. telescope of the Algonquin Radio Observatory show that this source contains high- density structures (densities greater than 1O~ electrnns;cc) as do other anomalous OH emission source. Of three discrete components to the source, the strongest is identifiable with a compact knot of nebulosity on Palomar 48-in. Schmidt plates. On a red-sensitive plate, this object has an almost stellar core (diameter 6 sec of arc or less) with a flare of nebulosity about 15 sec of arc long extending from it. It is barely ~visible on the blue Palomar print, and is not detectable on one plate taken in the near infrared. Hence the object is apparently a highly obscured Ha object with no visible stellar core. The second strongest radio component is coin ci- dent with an isolated knot of nebulosity about 2 min of arc across. The third and weakest discrete radio component is coincident, or nearly so, with the position of the strong anomalous OH emission. As has been previously noted, no optical feature lies at this position. However, it is of interest to note the high degree of similarity between the radio spectrum of this component and that predicted by Davidson and Harwit (Astrophys. J. 148, 443, 1967) for "cocoon stars." Observations in the infrared windows might serve to confirm the cocoon star interpretation.
- Publication:
-
The Astronomical Journal Supplement
- Pub Date:
- 1968
- Bibcode:
- 1968AJS....73S...1A