Comment on red giant envelopes as broad emission-line clouds in active galactic nuclei

Details Comment on red giant envelopes as broad emission-line clouds in active galactic nuclei Comment on red giant envelopes as broad emission-line clouds in active galactic nuclei

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393...87k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 87-89.

Astronomy and Astrophysics

Astrophysics

2

Active Galactic Nuclei, Emission Spectra, Interstellar Matter, Main Sequence Stars, Red Giant Stars, Stellar Envelopes, Line Spectra, Photoionization, Star Clusters, Stellar Luminosity

Scientific paper

It is found that, if the broad emission-line clouds were circumstellar envelopes of red giants, the number of postmain-sequence stars needed would be more than about 4 x 10 exp 9. The IR luminosity from the stars would then be greater than the optical and UV luminosity of the AGN, and the star-star collision time would be less than about 10,000 yr. Because of these difficulties, this postulate is not considered a tenable one for the great majority of AGN.

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