Abstract
view Abstract Citations (27) References (6) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Shock-wave thermalization. Colgate, S. A. Abstract The cooling of the high-ion-temperature precursor of the shock wave in the presumed low-density envelope of a Type II supernova is examined in greater detail for the galactic production of deuterium and some of the other light elements. When the combined effects of a modified ion energy loss rate, modification and inclusion of electron bremsstrahlung, and the truncation of the bremsstrahlung at the Planck limit are taken into account, the cooling time becomes 30 Thomson scattering periods plus about 10 times the square root of the kinetic energy (in MeV per nucleon) of fluid flow behind the shock. This cooling time is roughly a tenfold reduction below the 1973 estimate of Colgate, but fortunately there was a fivefold reduction in the favorable 1974 nucleosynthesis calculations of Epstein, Arnett, and Schramm. In addition, at these shorter cooling times, it is found that photon diffusion from the Planck radiation will limit the precursor phenomenon to shock energies greater than or equal to 18 MeV per nucleon, so that the overproduction of Li-7, Be-9, and B-11 which resulted from the earlier network calculations is greatly reduced. Publication: The Astrophysical Journal Pub Date: January 1975 DOI: 10.1086/153348 Bibcode: 1975ApJ...195..493C Keywords: Deuterium; Ion Temperature; Nuclear Fusion; Shock Wave Propagation; Supernovae; Bremsstrahlung; Compton Effect; Deionization; Light Elements; Nonequilibrium Conditions; Astrophysics full text sources ADS |
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