The near-infrared oxygen I lines of the planetary nebula IC 4997

Details The near-infrared oxygen I lines of the planetary nebula IC 4997 The near-infrared oxygen I lines of the planetary nebula IC 4997

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..799r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 799-802. Research supported by the Aerospace Corp.

Astronomy and Astrophysics

Astrophysics

28

Infrared Spectra, Near Infrared Radiation, Oxygen, Planetary Nebulae, Absorption Cross Sections, Emission Spectra, Fluorescence, Gas Ionization, H Alpha Line, Lyman Beta Radiation

Scientific paper

Spectrophotometry from 0.84 to 1.32 microns of the compact planetary nebula (PN) IC 4997 is presented. The O I 11287 A line is found to be comparable in strength to O I 8446 A. This observation, together with the absence of the O I line at 13164 A, indicates that Bowen fluorescence by Ly-alpha is the principal excitation mechanism for these oxygen lines. Although this is believed to be the process which creates the 8446 A line in the hot, partially ionized zones of Seyfert galaxies, such regions are not present in IC 4997. An alternative mechanism in which the O I lines arise from Bowen fluorescence in the cool, neutral shell of gas which surrounds IC 4997 is considered.

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