The Cygnus Loop’s distance, properties, and environment driven morphology

  title={The Cygnus Loop’s distance, properties, and environment driven morphology},
  author={Robert A. Fesen and Kathryn E. Weil and Ignacio A. Cisneros and William P. Blair and John C. Raymond},
  journal={Monthly Notices of the Royal Astronomical Society},
The Cygnus Loop is among the brightest and best studied evolved Galactic supernova remnants. However, its distance has remained uncertain thus undermining quantitative understanding about many of its fundamental properties. Here we present moderate-dispersion spectra of stars with projected locations toward the remnant. Spectra of three stars revealed Na I 5890,5896 A and Ca II 3934 A absorption features associated with the remnant's expanding shell, with velocities ranging from -160 to +240 km… 

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