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Far-ultraviolet observations of the Crab Nebula using the Hopkins Ultraviolet TelescopeObservations 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.
Document ID
19930031001
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Blair, William P.
(Johns Hopkins Univ. Baltimore, MD, United States)
Long, Knox S.
(Space Telescope Science Inst. Baltimore, MD, United States)
Vancura, Olaf
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bowers, Charles W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Conger, Sarah
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Davidsen, Arthur F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kriss, Gerard A.
(Johns Hopkins Univ. Baltimore, MD, United States)
Henry, Richard B. C.
(Oklahoma Univ. Norman, United States)
Date Acquired
August 15, 2013
Publication Date
November 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 399
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A14998
Funding Number(s)
CONTRACT_GRANT: NAS5-27000
CONTRACT_GRANT: NAG5-988
Distribution Limits
Public
Copyright
Other

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