Strange-mode instabilities in the nonlinear regime

Details Strange-mode instabilities in the nonlinear regime Strange-mode instabilities in the nonlinear regime

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aspc..233..227g&link_type=abstract

P Cygni 2000: 400 Years of Progress, ASP Conference Proceeding Vol. 233, Edited by M. de Groot and C. Sterken, San Francisco: As

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We review general properties of strange-mode instabilities having growth rates in the dynamical range which can be identified in a variety of models for luminous stars, such as massive objects (including models for P Cygni and eta Carinae) and Wolf-Rayet stars. To determine the result of the instabilities numerical simulations of their evolution into the nonlinear regime have been performed. Multiple shocks are formed and velocity amplitudes of the order of 100 km/s are reached which can imply direct mass loss in the case of massive objects. Although some characteristic time-scales can be identified in the final state, they are in general not strictly periodic. Rather chaotic or at most quasi-periodic variability is to be expected in strange-mode unstable objects.

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