Young oxygen-rich supernova remnants. 2: an oxygen-rich emission mechanism

Details Young oxygen-rich supernova remnants. 2: an oxygen-rich emission mechanism Young oxygen-rich supernova remnants. 2: an oxygen-rich emission mechanism

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439..381s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 439, no. 1, p. 381-398

Astronomy and Astrophysics

Astrophysics

29

Oxygen, Shock Waves, Spectral Emission, Stellar Models, Supernova Remnants, Ultraviolet Spectra, Abundance, Cooling Flows (Astrophysics), Thermal Stability, Velocity Distribution

Scientific paper

An emission mechanism is presented for the observed oxygen-rich plasma emission in young, oxygen-rich supernova remnants (OSNRs). The mechanism involves the interaction of a fast moving 'blob' of oxygen-rich material with SNR medium, forming a bow-shock/cloud- shock structure. The shock emission is then determined to drive a weak R-type ionization front through the oxygen-rich material. The combined shock and ionization front emission reproduces the major features of the observed optical and UV spectrum. Dynamical constraints based on the observed motions, lifetimes, and estimated densities of the oxygen-rich knots are used to determine model parameters. The plasma composition, predominantly (Ne/O) approximately = -0.34, used is consistent with massive stellar evolution and explosive synthesis models. Significantly, the unusually high (O III) temperature-sensitive ratio is reproduced simultaneously with the low ionization, optical, (O I), SNR E102.2-7219 from observations of Blair et al. (1989). Specific abundance variations were not used to make detailed fits to the observations, detailed abundance determination will require further observations.

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