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| H-alpha images of the Cygnus Loop - A new look at shock-wave dynamics in an old supernova remnant
Attention is given to deep H-alpha images of portions of the east, west,and southwest limbs of the Cygnus Loop which illustrate several aspectsof shock dynamics in a multiphase interstellar medium. An H-alpha imageof the isolated eastern shocked cloud reveals cloud deformation and gasstripping along the cloud's edges, shock front diffraction andreflection around the rear of the cloud, and interior remnant emissiondue to upstream shock reflection. A faint Balmer-dominated filament isidentified 30 arcmin further west of the remnant's bright line ofwestern radiative filaments. This detection indicates a far morewesterly intercloud shock front position than previously realized, andresolves the nature of the weak X-ray, optical, and nonthermal radioemission observed west of NGC 6960. Strongly curved Balmer-dominatedfilaments along the remnant's west and southwest edge may indicate shockdiffraction caused by shock wave passage in between clouds.
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| The Cygnus Loop at 408 MHz - Spectral variations, and a better overall view
Observations of the Cygnus Loop made at 408 MHz are presented. Radiospectral variations within the remnant are revealed by comparing the newobservations with existing data taken at 2.695 GHz. The brightnortheastern arc of the Cygnus Loop has a radio spectral index alpha ofroughly 0.35, whereas the southern portion of the remnant generallyshows steeper spectra, with alpha up to roughly 0.55. There is probablya portion of the faint radio emission from the northeastern arc that hasa flatter spectrum than the brighter radio emission nearby. Thesedifferences are discussed in relation to mechanism for producing radioemission in SNRs and to the overall structure of the remnant. Theobservation confirm that there is faint radio emission outside thebright limb-brightened 'shell' of the remnant, but this is limited tothe west only. The faint halo of X-rays around the remnant is discussedand interpreted as originating from dust scattering.
| Find a supernova remnant.
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| Stars having peculiar spectra. Thirteen new variable stars.
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