Near-infrared scans of planetary nebulae

Details Near-infrared scans of planetary nebulae Near-infrared scans of planetary nebulae

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...133..395p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 133, no. 2, April 1984, p. 395-402.

Astronomy and Astrophysics

Astronomy

21

Cosmic Dust, Emission Spectra, Infrared Astronomy, Interstellar Matter, Near Infrared Radiation, Planetary Nebulae, Emissivity, Heat Balance, Infrared Spectra, Thermal Emission

Scientific paper

In the present results from a program of near-IR scanning of planetary nebulae, the observed flux is in most cases dominated by free-free emission. In three of the nebulae, dust excess continua at K are comparable to free-free emission, although there appear to be no significant changes in source size between the J and K bands. Profiles in IC 418 are strongly variable, changing in width by a factor of about 2 between 1.2 and 3.6 microns. Attention is given to the thermal balance of grains in IC 418, as well as to the optical properties of grain materials required to maintain high dust temperatures. It is found necessary to postulate grains of radius as small as 0.001 microns, with low thermal capacity, or grain materials with anomalous optical properties.

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