Computer Science
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..377s&link_type=abstract
In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 377-386 (SEE N92-21874 12-90)
Computer Science
2
Accretion Disks, Gamma Ray Spectra, Nuclear Fusion, Solar Radiation, Stellar Luminosity, Stellar Mass, Thermonuclear Reactions, Carbon, Computer Programs, Equations Of State, Gamma Ray Bursts, Hydrodynamics
Scientific paper
Studies which examine the consequences of accretion, at rates of 10-9 solar mass/yr and 10-10 solar mass/yr, onto an ONeMg white dwarf with a mass of 1.35 solar masses are performed. In these studies, a Lagrangian, hydrodynamic, one-dimensional computer code was used. The code now includes a network with 89 nuclei up to Ca-40, elemental diffusion, new opacities, and new equation of state. The initial abundance distribution corresponded to a mixture that was enriched to either 25, 50, or 75 percent in products of carbon burning. The remaining material in each case is assumed to have a solar composition. The evolution of the thermonuclear runaway in the 1.35 solar mass white dwarf, with M = 10-9 solar mass, produced peak temperatures in the shell source exceeding 300 million degrees. The sequence produced significant amounts of Na-22 from proton captures onto Ne-20 and significant amounts of Al-26 from proton captures on Mg-24. This sequence ejected 5.2 x 10-6 solar mass moving with speeds from approximately 100 km/s to 2300 km/s. When the mass accretion rate was decreased to 10-10 solar mass, the resulting thermonuclear runaway produced a shock that moved through the outer envelope of the white dwarf and raised the surface luminosity to L greater than 107 solar luminosity and the effective temperature to values exceeding 107 K. The interaction of the material expanding from off of the white dwarf with the accretion disk should produce a burst of gamma-rays.
Politano Michael
Sparks Warren M.
Starrfield Summer
Truran Jame. W.
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