The core-halo structure of IC 418

Bibcode
1990A&A...234..454P
Phillips, J. P.; Riera, A.; Mampaso, A.
Bibliographical reference

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

Advertised on:
8
1990
Number of authors
3
IAC number of authors
2
Citations
10
Refereed citations
10
Description
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.
Type
Refereed
H II regions
Planetary nebulae

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