EXOSAT observations of the Kepler supernova remnant

Details EXOSAT observations of the Kepler supernova remnant EXOSAT observations of the Kepler supernova remnant

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..925s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 925-933.

Astronomy and Astrophysics

Astrophysics

15

Exosat Satellite, Stellar Spectra, Supernova Remnants, Supernovae, X Ray Spectra, Interstellar Extinction, Iron, Limb Brightening, Stellar Evolution

Scientific paper

The medium-energy experiment on board Exosat was used to measure the X-ray spectrum of the Kepler supernova remnant over the range 1.5-10 keV. An Fe emission line was clearly resolved with an energy of about 6.5 keV and equivalent width of about 1.8 keV. This was superposed on a continuum with a temperature of 5.0(+3.8, -1.9) keV. The medium-energy spectrum is shown to be consistent with a model in which the Kepler SNR is presently in a Sedov phase of evolution, the 5 keV continuum arises from the shocked interstellar/circumstellar medium, and thermal (but not ionization) equilibrium exists between electrons and ions behind the primary shock front. However, in this case, an overabundance of iron by more than 6 times cosmic is required.

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