G5.89-0.39: A compact H II region with a very dense circumstellar dust torus

Details G5.89-0.39: A compact H II region with a very dense circumstellar dust torus G5.89-0.39: A compact H II region with a very dense circumstellar dust torus

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433..187h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 433, no. 1, p. 187-198

Astronomy and Astrophysics

Astronomy

22

Cosmic Dust, H Ii Regions, Infrared Astronomy, Infrared Spectra, Interstellar Extinction, Interstellar Matter, Stellar Envelopes, Astronomical Models, Continuums, Mathematical Models, Radiative Transfer, Space Infrared Telescope Facility

Scientific paper

We present the results of high angular resolution infrared observations of the compact H II region G5.89-0.39. Subarcsecond imaging at 1.65, 2.2, 3.6, and 4.8 microns and diffraction-limited scans at 50 and 100 microns have been obtained at NASA's Infrared Telescope Facility and Kupier Airborne Observatory and the Canada-France-Hawaii Telescope. We find a bipolar source morphology at the shortest infrared wavelengths, a compact single source at 4-5 microns, similar to that seen at 10 microns, and a very high optical depth, barely resolved far-infrared source. Spherical radiative transfer models have been used to estimate dust envelope properties; in spite of the obvious nonspherical geometry at short wavelengths, these models provide strong constraints on the overall properties of the circumnebular envelope. We find that the bulk of the circumstellar dust must be relatively close to the H II region, with a relatively steep gradient. The high column densities and steep density gradient imply densities at the inner edge of the cloud of order 107-108/cc. These results suggest that the compact H II region is surrounded by a very dense dust torus.

Affiliated with

Also associated with

No associations

Rating

G5.89-0.39: A compact H II region with a very dense circumstellar dust torus does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with G5.89-0.39: A compact H II region with a very dense circumstellar dust torus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and G5.89-0.39: A compact H II region with a very dense circumstellar dust torus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1788644