IRAS low-resolution spectral observations of the 10 and 18 micron silicate emission feature

Details IRAS low-resolution spectral observations of the 10 and 18 micron silicate emission feature IRAS low-resolution spectral observations of the 10 and 18 micron silicate emission feature

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..570s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 20, 1991, p. 570-579.

Astronomy and Astrophysics

Astronomy

49

Emission Spectra, Infrared Spectra, Late Stars, Silicates, Stellar Envelopes, Infrared Astronomy Satellite, Interstellar Extinction, Optical Thickness, Particle Size Distribution, Spectral Line Width

Scientific paper

The IRAS LRS Atlas contains 8-23 micron spectra of 1816 stars with silicate emission features. In order to study the shapes of the silicate dust features, the 117 stars whose emission features appear to be optically thin and which have the best signal-to-noise ratio at the longest wavelengths were analyzed. Simple spherical dust shell models were calculated in both the optically thin and the slightly optical thick approximations. From the comparison of the predicted spectra of the dust and stellar continuum, the emissivity function Kappa(lambda) was derived. In the different stars, the shape of the 10-micron feature is either narrow or broad and it is peaked either at about 9.7 microns or at 10 microns. Either particle size effects (particles above 0.75 microns in radius) or optical depth effects (central optical depth about 1) could broaden the 10-micron feature. Chemical composition differences no doubt are also important, particularly as regards the position of the peak of the 10-micron feature. The stars with the peak at 10 microns are more closely confined to the Galactic plane than the stars with the peak at 9.7 microns. The shape of the 18-micron feature is essentially the same in all stars, and can be used to extend the interstellar extinction curve past 13 to 22 microns.

Affiliated with

Also associated with

No associations

Rating

IRAS low-resolution spectral observations of the 10 and 18 micron silicate emission feature 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 IRAS low-resolution spectral observations of the 10 and 18 micron silicate emission feature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IRAS low-resolution spectral observations of the 10 and 18 micron silicate emission feature will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1316071