Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9080b&link_type=abstract
HST Proposal ID #9080
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #9080 Ism And Circumstellar Matter
Scientific paper
We request WFPC2 narrow band HAlpha and O III imaging of faint filaments in the northeastern Cygnus Loop that represent the location of the primary shock front as it first encounters the ISM. The primary character of these filaments is non- radiative, but certain filaments are poised at the onset of becoming radiative, providing a unique laboratory for testing shock model predictions of the development and evolution of astrophysical shock waves. We also request a STIS/MAMA far-UV spectrum cutting across one of the transition filaments that has a clean geometry {selected from the requested imagery} to study the physical scale over which the strong far-UV resonance lines of N V, C IV and He II ramp up in the post- shock flow. Reobservation of a set of HAlpha filaments first observed with HST/WFPC2 in 1997 will permit an accurate proper motion measurement which, in conjunction with existing ground- based measurements, will permit us to assess directly whether the filament has decelerated over the last 50 years.
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