Discovery of fast-moving nitrogen-rich ejecta in the supernova remnant Cassiopeia A

Details Discovery of fast-moving nitrogen-rich ejecta in the supernova remnant Cassiopeia A Discovery of fast-moving nitrogen-rich ejecta in the supernova remnant Cassiopeia A

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..378f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 378-388. Research supported by the University of Colo

Astronomy and Astrophysics

Astrophysics

87

Emission Spectra, Nitrogen Ions, Stellar Mass Ejection, Stellar Spectrophotometry, Supernova Remnants, Charge Coupled Devices, H Alpha Line, Nebulae, Radial Velocity

Scientific paper

Deep interference-filter CCD images of regions along the periphery of Cas A reveal the presence of several additional emission knots and extended diffuse nebulosity to the east and southwest of the remnant and well outside Cas A's main optical and radio shell. Comparisons with earlier published photographs indicate that five of these outlying knots exhibit large proper motions (0arcsec.50 - 0arcsec.65 yr-1). Spectra of these knots show only strong emission lines of Hα and [N II]. The detection of fast-moving nitrogen-rich knots represents the discovery of a new class of Cas A ejecta which the authors interpret as fragments from the progenitor's photospheric layers at the moment of supernova outburst. This implies a probable late WN spectroscopic classification (i.e., WN7 - WN9) for the Cas A progenitor star.

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