The spectral and spatial distribution of radiation from Eta Carinae. I - A spherical dust shell model approach

Details The spectral and spatial distribution of radiation from Eta Carinae. I - A spherical dust shell model approach The spectral and spatial distribution of radiation from Eta Carinae. I - A spherical dust shell model approach

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..841m&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 15, 1978, p. 841-852. Research supported by the Australian Research Grants Commit

Astronomy and Astrophysics

Astrophysics

50

Infrared Spectra, Interstellar Extinction, Radiation Distribution, Stellar Envelopes, Stellar Models, Stellar Spectra, Aluminum Oxides, Forsterite, Iron, Opacity, Optical Thickness, Radiative Transfer, Spatial Distribution

Scientific paper

An extended spherical circumstellar dust shell model in which the radiative-transfer problem is treated accurately is developed for Eta Car. It is found that both the spectral energy distribution, including the 10-micron silicate feature, and the spatial distribution of radiation can be well represented by the model, assuming that the shell consists of a mixture of grains with realistic opacity laws. In particular, it is concluded that the satisfactory representation of the 10-micron feature requires, in addition to silicates, grains which possess an emissivity maximum in the 12-14-micron region. The possibility that these grains consist of corundum (Al2O3) is investigated. The most satisfactory model uses an opacity law in which the silicate forsterite (Mg2SiO4), corundum, and iron grains contribute to the extinction optical depth at 1 micron in the ratio of 0.09:0.09:0.82. On the basis of the predicted shape of the 10-micron feature as would be measured with various apertures, it is concluded that there is some evidence for there being an enrichment of corundum grains relative to the silicate material in the outer regions. Core-region limb brightening is predicted in the infrared if the shell around Eta Car is spherically symmetric, but resolutions beyond the limit of existing telescopes using conventional techniques may be required to reveal it.

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