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Strange—Mode Instabilities in Luminous Stars
Author(s) -
Chernigovski S.,
Glatzel W.,
Fricke K. J.
Publication year - 2001
Publication title -
zamm ‐ journal of applied mathematics and mechanics / zeitschrift für angewandte mathematik und mechanik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 51
eISSN - 1521-4001
pISSN - 0044-2267
DOI - 10.1002/zamm.20010811503
Subject(s) - stars , physics , instability , amplitude , radiation pressure , nonlinear system , mode (computer interface) , astrophysics , range (aeronautics) , mechanics , classical mechanics , optics , aerospace engineering , quantum mechanics , computer science , operating system , engineering
If radiation pressure contributes significantly to the total pressure in models for the envelopes of hot and luminous stars, such as massive objects and Wolf—Rayet stars, strange—mode instabilities with growth rates in the dynamical range do occur. The properties of these mechanical instabilities are reviewed and an intuitive model of the underlying instability mechanism is discussed. Adopting spherical geometry the evolution of the instabilities has been followed into the nonlinear regime by numerical simulation. Multiple shocks are formed and velocity amplitudes above 10 2 km/sec are reached which can imply direct mass loss of the objects.