Strange modes

Details Strange modes Strange modes

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009coast.158..245s&link_type=abstract

"Communications in Asteroseismology, Vol.158, p. 245 Proceedings of "38th Liege International Astrophysical Colloquium: Evoluti

Astronomy and Astrophysics

Astrophysics

6

Scientific paper

Strange modes appear when the pulsation energy is strongly confined in a region where the radiation pressure is much larger than the gas pressure. Strange-mode instability, which occurs in an extremely nonadiabatic environment, generates a pair of a strongly excited mode and a strongly damped mode. This is caused by a significant phase difference between pressure and density maximum. The strange-mode instability seems responsible for complex light variations of luminous H-deficient stars such as R CrB stars and extreme-helium B stars. It is also suggested that strange modes are involved in pulsations in Wolf-Rayet stars, Luminous Blue Variables, and F-supergiant variables.

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