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Title:
The internal structure of the dust shell of Eta Carinae deduced from six channel 8-13 micron mapping
Authors:
Hackwell, John A.; Gehrz, Robert D.; Grasdalen, Gary L.
Affiliation:
AA(Wyoming, University, Laramie; Aerospace Corp., Space Sciences Laboratory, Los Angeles, CA), AB(Wyoming, University, Laramie; Minnesota, University, Minneapolis), AC(Wyoming, University, Laramie)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 1, 1986, p. 380, 381, 383 (11 ff.). NSF-USAF-supported research. (ApJ Homepage)
Publication Date:
12/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMIC DUST, INFRARED SOURCES (ASTRONOMY), NOVAE, IMAGE ENHANCEMENT, MAXIMUM ENTROPY METHOD, OPTICAL THICKNESS, SILICATES
DOI:
10.1086/164779
Bibliographic Code:
1986ApJ...311..380H

Abstract

The authors have used a six channel infrared photometer to map η Carinae at 8.1, 8.9, 10.4, 11.3, 12.2, and 13.1 μm. The half-power diameter of the beam on the CTIO 4 m telescope was 1arcsec.7. The maps resolve a "cool" double source in the core and show the presence of a third "hot" source which dominates the core at 8.1 μm. The homunculus has a sharp edge and is the same size (12arcsec×18arcsec) at all wavelengths between 8 and 13 μm. The authors also see bipolar "horns" in the homunculus which are most apparent at the longest wavelengths. A straightforward silicate emission model has been fitted to the six channel spectra at each position in the infrared nebula.

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