Broad emission lines from the mass-loss envelopes of giant stars in active galactic nuclei

Details Broad emission lines from the mass-loss envelopes of giant stars in active galactic nuclei Broad emission lines from the mass-loss envelopes of giant stars in active galactic nuclei

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..163s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 163-171.

Astronomy and Astrophysics

Astrophysics

94

Active Galactic Nuclei, Emission Spectra, Red Giant Stars, Star Formation, Stellar Envelopes, Stellar Mass Ejection, Density Distribution, Late Stars, Star Clusters, Stellar Luminosity

Scientific paper

The X-ray and UV luminosity of an active galactic nucleus will irradiate and ionize the mass-loss envelopes of giant stars in the central star cluster of the host galaxy. For a star with mass loss at 10-5M_sun;yr-1 situated 1018cm from the AGN, the inverted Strömgren sphere in the mass-loss envelope with extend down to a radius of 1014cm at which point the density is 109cm-3. The authors propose that the broad emission-line clouds in active galaxies are the ionized mass-loss envelopes of giant stars with the line widths due to orbital motion in the massive central star cluster. It is noted that although the giants do collide and their envelopes are removed, the envelopes are replenished within a few years.

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