The effect of dust shell emission on the strengths of infrared spectral features in OH/IR stars.
Abstract
The effect of thermal emission from dust shell on the strengths of molecular CO and H2O spectral features in late-type stars with circumstellar dust shells is investigated using theoretical spherical dust shell models for cool stars in the temperature range 2500-3000 K. The optical depth at which the strengths of the spectral bands are significantly affected is calculated, showing that the dust shell emission affects the CO and H2O molecular band strengths in the NIR only if the optical depth of the dust exceeds 2 microns. At this dust-shell depths, the strength of the CO index is affected considerably more than that of H2O.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- 1990
- DOI:
- 10.1017/S1323358000023523
- Bibcode:
- 1990PASA....8..278H
- Keywords:
-
- Cosmic Dust;
- Hydroxyl Emission;
- Infrared Stars;
- Stellar Envelopes;
- Stellar Spectra;
- Atmospheric Attenuation;
- Energy Spectra;
- Infrared Spectra;
- Radiative Transfer;
- Stellar Models;
- Astrophysics