Emission, absorption and self-absorption in circumstellar dust shells

Details Emission, absorption and self-absorption in circumstellar dust shells Emission, absorption and self-absorption in circumstellar dust shells

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..801m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 801-822. Research supported by the Australian Resea

Astronomy and Astrophysics

Astronomy

20

Absorption Spectra, Dust, Emission Spectra, Radiative Transfer, Self Absorption, Stellar Envelopes, Atmospheric Temperature, H Lines, Opacity, Optical Thickness, Particle Size Distribution, Stellar Models

Scientific paper

The conditions under which the 10 and 20 micron silicate features should appear in emission or absorption are investigated, using an extended spherical circumstellar dust shell model, in which radiative transfer is treated accurately. Results, which are presented graphically, demonstrate that compact shells characterized by inward peaking density distributions exhibit stronger emission features and weaker absorption features than those of the reverse characteristics. In the transition of the 10 micron feature from emission to absorption, a self-absorption domain is identified, where the wings of the feature appear in emission, while the center is in absorption. The reversal is caused by the increasing quantities of dust at low temperatures. Reversal temperatures for the 10 to 20 micron features are defined according to the temperature of the effective radiating surface, at which reversal from emission to absorption takes place. It is shown that these temperatures are not constant, but show a marked dependence on the shell parameters. Attention is also given to the effects of varying the strength of the silicate opacity features in relation to circumstellar dust opacities.

Affiliated with

Also associated with

No associations

Rating

Emission, absorption and self-absorption in circumstellar dust shells 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 Emission, absorption and self-absorption in circumstellar dust shells, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Emission, absorption and self-absorption in circumstellar dust shells will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1515627