The core-halo structure of IC 418

Details The core-halo structure of IC 418 The core-halo structure of IC 418

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..454p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 454-468.

Astronomy and Astrophysics

Astronomy

10

Astronomical Spectroscopy, H Ii Regions, Halos, Planetary Nebulae, Infrared Astronomy Satellite, Millimeter Waves

Scientific paper

Deep spectra of the planetary nebula IC 418 were obtained in the wavelength range 4190-5850 A. The data made it possible to map an extended halo about the source, evaluate the variation in halo intensity with radius, and model the results in terms of a radially symmetric dust scatter envelope. It is suggested that the nebula is in a relatively early stage of evolutionary expansion, with a lifetime of no more than about 850 yrs. It is also believed that the enveloping halo zone represents an earlier mass-ejection phase in the low-mass carbon star progenitor.

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