Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..97..405h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 97, no. 2, Dec. 1983, p. 405-419.
Astronomy and Astrophysics
Astronomy
12
Cosmic Dust, Giant Stars, Infrared Astronomy, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Absorption Spectra, Density Distribution, Emission Spectra, Optical Properties, Optical Thickness, Oxygen, Radiative Transfer, Stellar Models
Scientific paper
The author studies the influence of model parameters adopted in radiative transfer computations on the shape of the 10 and 20 μm bands observed in IR spectra of Becklin-Neugebauer objects and O-rich giants and supergiants. The calculations show that besides the wavelength-dependence of the absorption efficiency the optical depth is the most important parameter. From the appearance of the 10 μm feature three different regions can be distinguished: emission, self-absorption and absorption. The most important effect demonstrated by the model computations is that an emission feature shows a weaker variation than an absorption feature if the optical depth is increased or decreased. Furthermore shells with central-peaked density distributions should exhibit stronger emission bands and weaker absorption bands than shells with a constant density.
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