Nonlinearity of nonradial modes in evolved stars

Details Nonlinearity of nonradial modes in evolved stars Nonlinearity of nonradial modes in evolved stars

2003-01-24

arxiv.org/abs/astro-ph/0301504v1

Astrophys.Space Sci. 284 (2003) 273-276

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in "Asteroseismology Across the HR Diagram", Eds. Thompson M.J., Cunha M.S., Monteiro M.J.P.F.G.

Scientific paper

We show that in evolved stars, even at relatively low surface amplitudes, nonradial modes become strongly nonlinear in the hydrogen shell source, where the Brunt-Vaisala frequency has its absolute maximum. The measure of nonlinearity is the product of horizontal displacement times the radial wavenumber. It becomes large already in evolved delta-Scuti stars. This nonlinearity presents a major problem for interpretations of amplitude modulation in RR Lyrae stars in terms of nonradial mode excitation.

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