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Non-Normal Pulsation

  • M. Goupil, Z. Kolláth, N. Nardetto, P. Kervella, P. Yecko (a1) and J. Pohlmeyer (a1)...

Abstract

Klein-Gordon operators with complex potentials are formulated as model systems to examine the possible impact of non-normality on the stellar pulsation eigenvalue problem. Computations of spectra, ε-pseudospectra and resolvent norms for these operators show that extended regions of complex potential, corresponding in stars to non-adiabatic regions, leads to strong non-normality. Introduction of an advective term further increases non-normal properties. Prospective model improvements and implications for resonances and for nonlinear pulsation are considered.

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Non-Normal Pulsation

  • M. Goupil, Z. Kolláth, N. Nardetto, P. Kervella, P. Yecko (a1) and J. Pohlmeyer (a1)...

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