Anomalous extinction in the planetary nebula Abell 30

Details Anomalous extinction in the planetary nebula Abell 30 Anomalous extinction in the planetary nebula Abell 30

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..124g&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 124-130.

Astronomy and Astrophysics

Astronomy

70

Early Stars, Interstellar Extinction, Planetary Nebulae, Spectral Energy Distribution, Stellar Spectra, Subdwarf Stars, Absorption Spectra, Graphite, Hot Stars, Stellar Envelopes, Stellar Spectrophotometry, Stellar Winds, Ultraviolet Astronomy

Scientific paper

The stellar continuous energy distribution from 8000 to 1250 A in Abell 30 is quite peculiar. The observed flux can be understood if a hot central star (approximately 200,000 K) is immersed in an absorbing dust cloud which has anomalous absorption with its peak near 2470 A. The dust nebula is a strong infrared source, maintained by conversion of the stellar UV flux. The internal reddening is E(B - V) = 0.30 mag and reaches 2.5 mag at 2470 A; it is best matched not by graphite but by laboratory observations of carbon smoke. Intense P Cygni lines show that a strong stellar wind exists. The central star may be an O subdwarf, approaching more nearly a helium-carbon degenerate DO.

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