Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990uat..rept.....y&link_type=abstract
Final Technical Report, 15 Aug. 1989 - 14 Sep. 1990 Arizona Univ., Tucson.
Astronomy and Astrophysics
Astronomy
Infrared Astronomy, Infrared Astronomy Satellite, Infrared Radiation, Ophiuchi Clouds, Sky Surveys (Astronomy), Star Clusters, B Stars, Dust, Gas Temperature, Luminosity, Radiation Distribution
Scientific paper
An investigation of the infrared emission energetics and embedded population in the rho Ophiuchi dark cloud is summarized. With a distance of approximately 140 pc, the rho Ophiuchi cloud is one of the closest regions of recent star formation. It is also one of the best studied such regions with numerous observations at all wavelengths. The IRAS data of the cloud provided a new glimpse of the overall structure of the cloud. In particular, the interaction of radiation from the Sco-Oph OB Association on the external heating of the cloud was very evident on Skyflux and Survey Co-Add images produced by IRAS. The infrared survey also revealed a number of new embedded sources in the cloud which have subsequently been observed from the ground. An earlier study explored the overall energetics of the cloud using the IRAS data. The main conclusions of that work were: (1) the overall luminosity of the cloud is well explained by the emission of the known B-stars, HD 147889, SR-3, and S1, along with a 15 percent contribution from the external radiation field; (2) the dust physical temperatures were significantly lower than the observed CO gas temperatures; and (3) dust grains are heated to only 10 percent to 20 percent of the total depth into the cloud. This analysis is extended by drawing on data from large-scale CO maps and from near-infrared surveys of the embedded population.
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