Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9013295b&link_type=abstract
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Astronomy and Astrophysics
Astronomy
Interstellar Matter, Nonequilibrium Ionization, Supernova Remnants, White Dwarf Stars, X Ray Astronomy, Exosat Satellite, Hydrodynamic Equations, Ion Production Rates, Mass Distribution, X Ray Stars
Scientific paper
A numerical study of the x ray emission of Tycho's supernova remnant which at an age of approximately 430 years did not reach its adiabatic phase of expansion is reported. The carbon deflagration of a C+O white dwarf, which influences the hydrodynamical evolution of the remnant, is studied. Using Nomoto's W7 model of an exploding white dwarf as initial condition, the hydrodynamical and ionizational evolution for different densities of the interstellar medium are followed. They are compared to the emitted spectra with EXOSAT GSPC observations. To match the fluxes of the observed x ray lines a partial mixing is required. The results indicate that the density of the ambient medium is between 0.5 and 10/cu cm, and the distance to Tycho is about 3kpc. The actual physical uncertainties in modeling supernova remnants are discussed. They are related to the magnitude of the possible errors of the derived parameters.
Brinkmann Wolfgang
Fink Henner
Haberl Franck
Smith Aaron
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