Publication Abstracts

Skalafuris 1968

Skalafuris, A.J., 1968: Radiative shock structure — Theory and observations. J. Quant. Spectrosc. Radiat. Transfer, 8, 515-530, doi:10.1016/S0022-4073(68)80132-3.

Stellar observations of post-shock spectra show a post-shock density much higher than the Rankine-Hugoniot relations indicate, and a much lower temperature. These emission spectra are wide with a redward absorption core. Both move synchronously with the shock speed. Before radiating, the post-shock region cools by ionizational collisions which compress the gas above classical limits. The pre-shock absorption removes a core from the post-shock emission line. The dimensions of the wave, basically a function of mass penetration, are determined by the inelastic cross section for ionization. This cross section depends on the electron temperature that falls considerably below the ion and atom temperatures, returning to them only during final post-shock radiative recombination. Emitted photons whose mean free paths match the shock wave dimensions will cause pre-shock ionization. In a cold gas, heavily populated in the ground state, the Lyman continuum induces the precursor effect and is absent from the emission spectrum. This preabsorption of post-shock emission closes a thermodynamic cycle which perpetuates as a progressive wave in stars. Thus, the entropy flow reverses itself and classical theorems that require its irreversibility must be re-examined.

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BibTeX Citation

@article{sk01000b,
  author={Skalafuris, A. J.},
  title={Radiative shock structure — Theory and observations},
  year={1968},
  journal={J. Quant. Spectrosc. Radiat. Transfer},
  volume={8},
  pages={515--530},
  doi={10.1016/S0022-4073(68)80132-3},
}

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RIS Citation

TY  - JOUR
ID  - sk01000b
AU  - Skalafuris, A. J.
PY  - 1968
TI  - Radiative shock structure — Theory and observations
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 8
SP  - 515
EP  - 530
DO  - 10.1016/S0022-4073(68)80132-3
ER  -

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