Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..247m&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 247-253. Research supported by the John Simon Guggenheim Foundation;
Astronomy and Astrophysics
Astrophysics
14
High Temperature Plasmas, Plasma Spectra, Rarefied Plasmas, Supernova Remnants, X Ray Spectra, Abundance, Astronomical Models, Energy Spectra, Nebulae, Oxygen Spectra
Scientific paper
Low-energy X-ray spectra are presented for the entire Vela supernova remnant (SNR), the two most intense subregions of the Vela SNR, and the Puppis A SNR. Acceptable chi-squared fits are obtained from the model of a high-temperature low-density plasma with Allen cosmic abundances when thermal bremsstrahlung, radiative recombination, line emission, and interstellar absorption are included. A suggested increase of 45-fold in the Si abundance for the entire Vela SNR is found unacceptable by chi-squared tests of the present spectra. The two enhanced regions of Vela are found to have different temperatures. A deficiency of at least a factor of 3 is seen in the O VII and O VIII emission from the entire Vela SNR. Because ultraviolet observations indicate a normal abundance of oxygen, this is interpreted as evidence for the existence of nonequilibrium conditions in the emitting plasma.
Garmire Gordon P.
Moore Wayne E.
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