Far-ultraviolet observations of the Crab Nebula using the Hopkins Ultraviolet Telescope

Details Far-ultraviolet observations of the Crab Nebula using the Hopkins Ultraviolet Telescope Far-ultraviolet observations of the Crab Nebula using the Hopkins Ultraviolet Telescope

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..611b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 611-620.

Astronomy and Astrophysics

Astrophysics

24

Astronomical Spectroscopy, Crab Nebula, Oxygen Spectra, Supernova Remnants, Ultraviolet Telescopes, Astro Missions (Sts), Far Ultraviolet Radiation

Scientific paper

Observations of the FUV spectrum of the central portion of the Crab Nebula SNR using the Hopkins Ultraviolet Telescope (HUT) aboard the Astro-1 space shuttle mission in December 1990 are reported. The C IV 1549-A emission line shows two resolved components representing the front and back sides of the shell expanding at roughly +/- 1100 km/s. The He II 1640-A emission line shows only a blueshifted component corresponding to the near side of the shell. The HUT observation is compared to optical emission-line imagery and to archival IUE observations. This comparison indicates that a distribution emission component, consisting of either a number of individually faint filaments or a diffuse component, produces the bulk of the emission seen by HUT. A grid of photoionization models for the Crab Nebula filaments is calculated to infer the range of limits. The differing UV line ratios observed for these components indicates that varying carbon and/or He abundances are present in the observed material.

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