Volume 374, Number 2, August I 2001
|Page(s)||662 - 674|
|Section||Stellar structure and evolution|
|Published online||15 August 2001|
Magnetic wave energy fluxes for late-type stars
I. Longitudinal tube waves
Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstr. 15, 69121 Heidelberg, Germany
2 Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA
Corresponding author: P. Ulmschneider, email@example.com
Accepted: 10 May 2001
The wave energy fluxes carried by longitudinal tube waves along thin vertical magnetic flux tubes embedded in atmospheres of late-type stars are computed. The main physical process responsible for the generation of these waves is the nonlinear time-dependent response of the flux tubes to continuous and impulsive external turbulent pressure fluctuations, which are represented here by an extended Kolmogorov spatial and modified Gaussian temporal energy spectrum. Both the wave energy fluxes and spectra are calculated for population I stars with effective temperatures ranging from Teff = 3500 K to 7000 K, and with gravities in the range . The obtained results show that the computed wave energy may significantly contribute to the enhanced heating observed in magnetic regions of late-type stars.
Key words: methods: numerical / stars: chromospheres / stars: coronae / stars: magnetic fields / MHD
© ESO, 2001
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