Highest velocity ejecta of Cassiopeia A

Details Highest velocity ejecta of Cassiopeia A Highest velocity ejecta of Cassiopeia A

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329l..89f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 329, June 15, 1988, p. L89-L92.

Astronomy and Astrophysics

Astronomy

58

Cassiopeia A, Nitrogen, Optical Emission Spectroscopy, Stellar Envelopes, Stellar Mass Ejection, Supernova Remnants, Abundance, Charge Coupled Devices, Forbidden Transitions, Radial Velocity, Radio Sources (Astronomy), Stellar Mass

Scientific paper

CCD interference-filter images and spectroscopy of Cassiopeia A's outlying optical emission knots are presented. Six new high-velocity forbidden N II-emitting knots are identified, which increases the total now known to 15. New spectra of seven of these knots suggest high N abundances. Spectra, radial velocity, and proper motion data indicate that these outlying knots possess ejection velocities between 7000 and 8600 km/s and are probably material from the progenitor's outer layers. These observations suggest that the Cas A supernova had a maximum expansion velocity of at least 8500 km/s, a substantial nitrogen-rich but hydrogen-deficient envelope, an explosion date around A.D. 1680, and a W progenitor. Cas A's northeastern emission jet, which consists of sulfur-rich ejecta, appears to be an isolated, well-collimated structure extending at least 265 arcsec from the remnant center. Such radial distances imply ejection velocities of up to 11,000 km/s and at least a partially asymmetric stellar disruption.

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