Near-infrared spectrophotometry of Crab Nebula filaments

Details Near-infrared spectrophotometry of Crab Nebula filaments Near-infrared spectrophotometry of Crab Nebula filaments

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..619h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 619-629.

Astronomy and Astrophysics

Astronomy

30

Abundance, Astronomical Photometry, Crab Nebula, Infrared Astronomy, Near Infrared Radiation, Spectrophotometry, Cosmochemistry, Data Acquisition, Data Reduction, Emission Spectra, Line Spectra, Radiant Flux Density, Supernova Remnants

Scientific paper

Spectra from approximately 6500 A to 10,200 A have been obtained for 14 positions among the Crab nebula filaments, and the features of the spectra are discussed. The forbidden Fe II 8617 line is roughly one-fourth the strength of H-beta throughout the nebula, making it suitable for deriving an iron abundance. The observed forbidden S III 9532/forbidden S II 6724 ratio is directly correlated with forbidden O III 5007/forbidden O II 3727, contrary to the model results of Henry and MacAlpine (1982). The strengths of forbidden Ni II 7378 and forbidden S II 6724 are directly correlated. Forbidden C I 9850 is not strongly correlated with either forbidden Ni II or forbidden S II, and its strength in most filaments is at least several times that predicted by the photoionization models of Henry and MacAlpine (1982). Observed forbidden O II temperatures agree closely with earlier measurements by Fesen and Kirshner (1982) and with results of photoionization models.

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