Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241..195a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Nov. 1, 1989, p. 195-207.
Astronomy and Astrophysics
Astronomy
25
Reflection Nebulae, Stellar Mass, Calibrating, Cosmic Dust, Optical Thickness, Spectral Energy Distribution, Stellar Color, Thermal Emission
Scientific paper
High-resolution infrared maps of part of the Homunculus nebula that surrounds the unstable, supermassive star Eta Carinae are presented. Maps at 1.2 and 2.2 microns show the effects of scattering in the nebula, whereas those at 3.8 and 4.8 microns reveal the thermal emission of the dust, and show a somewhat different morphology. The nebula is optically thin except very close to the central star, so the distribution and temperature of the dust can be deduced. Previous observations suggesting a disk of emission along the minor axis of the nebula are not confirmed. A reported source at 2.2 microns comparable in intensity to the central star is also not revealed in these data. Instead, the outflow is very clumpy, and the clumps tend to lie at low latitude in the bipolar flow. Throughout most of the nebula the temperature is maintained by an unknown mechanism at a value near 400 K. The projected distribution of dust requires that very little material is shed towards either pole. The bipolar outflow is, in effect, hollow.
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