Radiative shocks in atomic and molecular stellar-like atmospheres. V - Influence of the excited level of the hydrogen atom: The precursor structure

Details Radiative shocks in atomic and molecular stellar-like atmospheres. V - Influence of the excited level of the hydrogen atom: The precursor structure Radiative shocks in atomic and molecular stellar-like atmospheres. V - Influence of the excited level of the hydrogen atom: The precursor structure

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..233h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 233-245.

Astronomy and Astrophysics

Astrophysics

4

Atomic Excitations, Hydrogen Atoms, Shock Wave Propagation, Spectral Bands, Stellar Atmospheres, Variable Stars, Chemical Reactions, Electron Transitions, Energy Levels, Mathematical Models

Scientific paper

This paper is concerned with the problem of modelization of a radiative shock in atomic and molecular gas of hydrogen. The temperature (500-5000 K) and the density lie in the ranges found in cool pulsating stars. In this work we include the first excited level of the hydrogen atom and, consequently, both the Balmer continuum and the Lyman-alpha line. The consequences of the introduction of a three-level atom are investigated. In particular, it is shown that coupling between the Lyman-alpha line and the H2 molecular spectra is negligible. Finally, a three-photon precursor model for weak radiative shocks is given. The results show a smaller temperature than in the two-level atom models. The precursor sensitivity to the parameter describing the shape of the Balmer spectrum is also examined.

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