The shapes of the circumstellar silicate features

Details The shapes of the circumstellar silicate features The shapes of the circumstellar silicate features

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8714225l&link_type=abstract

Unknown

Physics

Cosmic Dust, Granular Materials, Photosphere, Silicates, Spectral Energy Distribution, Stellar Envelopes, Black Body Radiation, Emission Spectra, Infrared Spectra, Oxygen, Particle Size Distribution

Scientific paper

Around oxygen-rich stars we find that the spectra of most long-period variables (LPV) show an excess infrared emission which is attributed to circumstellar silicate dust grains. These grains produce emission features at about 10 and 18 micrometers due to bending and stretching modes of SiO respectively. It has been known (Forrest, Gillett and Stein 1975) that the spectral energy distribution of the 10 micrometers emission shows variations from star to star. With the availability of many IRAS Low Resolution Spectra (LRS) in the 9-22 micrometers region of M stars, we can now study the 10-micrometers feature to determine its uniformity (or lack thereof). For this analysis we assume that the 8-22 micrometers emission from these stars is produced by a) the stellar photosphere, b) a continuum emission from the dust grains and c) a strongly wavelength dependent dust grain emission term. By representing the first two terms with blackbody energy distributions and subtracting them from the observed spectrum, we are left with a remaining strongly wavelength dependent emission feature which we call the excess silicate or 10 micrometers emission.

Affiliated with

Also associated with

No associations

Rating

The shapes of the circumstellar silicate features 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 The shapes of the circumstellar silicate features, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The shapes of the circumstellar silicate features will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1658730