New clues to the Cassiopeia A supernova progenitor

Details New clues to the Cassiopeia A supernova progenitor New clues to the Cassiopeia A supernova progenitor

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..621f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 20, 1991, p. 621-625.

Astronomy and Astrophysics

Astrophysics

45

Ejecta, Nebulae, Stellar Spectra, Supernova Remnants, Filaments, Flocculating, Turbulent Mixing, Visible Spectrum

Scientific paper

Optical spectra of filaments in Cas A's northeastern ejecta jet reveal one knot which exhibits the H-alpha and forbidden N II emissions like those seen in the remnant's quasi-stationary flocculi plus forbidden O I, forbidden O III, and forbidden S II emissions like those of the remnant's fast-moving knots. Discovery of this chemically peculiar knot suggests that some turbulent mixing may have occurred in the remnant's jet between underlying O and S-rich gas and surface layer material. The mixed ejecta knot's composition further suggests that at the time of its supernova outburst the Cas A progenitor possessed a thin outer layer of hydrogen. The presence of photospheric hydrogen sets an important constraint on the evolutionary phase of this remnant's probable Wolf-Rayet progenitor and means that the Cas A supernova could have briefly displayed H-alpha emission at early phases like that seen for SN 1987 K.

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