Magnetic wave energy fluxes for late-type stars. I. Longitudinal tube waves

Details Magnetic wave energy fluxes for late-type stars. I. Longitudinal tube waves Magnetic wave energy fluxes for late-type stars. I. Longitudinal tube waves

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..662u&link_type=abstract

Astronomy and Astrophysics, v.374, p.662-674 (2001)

Astronomy and Astrophysics

Astrophysics

17

Methods: Numerical, Stars: Chromospheres, Stars: Coronae, Stars: Magnetic Fields, Mhd

Scientific paper

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 log g = 3-5. The obtained results show that the computed wave energy may significantly contribute to the enhanced heating observed in magnetic regions of late-type stars.

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