Mathematics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gpaw.book.....t&link_type=abstract
Generation and propagation of acoustic wave spectra in late-type stellar atmospheres., by Theurer, J.. Heidelberg Univ. (Germany
Mathematics
Scientific paper
The author improved earlier calculations of the generation of acoustic wave fluxes and spectra from the convection zones of late-type stars and computed new fluxes for low metal abundance stars. Using radiation-hydrodynamic codes he followed the time-dependent propagation of acoustic wave spectra and constructed stellar chromosphere models. It could be shown that the observed solar 3 min oscillations develop naturally from the acoustic spectra and that these spectra determine the detailed chromospheric structure. The main reason for converting the initial broad short period spectrum into a strongly peaked 3 min type resonance is shock merging. Different from monochromatic waves, acoustic spectra lead to a small number of strong shocks in the atmosphere, which allows the mean temperature to stay close to the radiative equilibrium value. In the middle and high chromosphere smaller shocks of higher frequency lead to a mean temperature rise. As one neglets time-dependent ionization, the strength of the strong shocks is overestimated because of which the simulated Ca and Mg line emission and the basal flux line is too high.
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