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Session 40 - Supernova Remnants & SN 1987A.
Display session, Thursday, January 08
Exhibit Hall,

[40.08] Spatially-Resolved FUV Spectra of the XA Region in the Cygnus Loop

C. Danforth, W. P. Blair (JHU/CAS), J. C. Raymond (SAO)

We present a UV-optical analysis of a complex cloud-shock interaction region known as ``XA'' in the Cygnus Loop supernova remnant. We combine optical [O III] \lambda5007 and H\alpha images and a far-UV image from the Ultraviolet Imaging Telescope with far-UV spectral data at 5 positions from the Hopkins Ultraviolet Telescope (HUT) and 22 spatially-resolved, low resolution IUE spectra in the 1200-2000 Å\ range. By mapping the spatial variations of strong forbidden, intercombination, and resonance lines across the region, we attempt to unravel the competing causes of the observed spatial variations, such as shock velocity or ionization variations, shock incompleteness, and resonance line scattering effects. By combining with low resolution optical longslit and echelle spectra, we hope to investigate the three-dimensional structure in this region to better understand the cloud-shock interaction process. This research is supported by NASA contract NAS 5-27000 and STScI grant GO-05365.01-93A to the Johns Hopkins University, and grant NAG 8-1074 to the Smithsonian Astrophysical Observatory.

Program listing for Thursday