Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009coast.158..252g&link_type=abstract
"Communications in Asteroseismology, Vol.158, p. 252 Proceedings of "38th Liege International Astrophysical Colloquium: Evoluti
Astronomy and Astrophysics
Astrophysics
5
Scientific paper
The final result of strange-mode instabilities in models of massive stars is determined by following their evolution into the nonlinear regime. In general the instability leads to finite amplitude pulsations which inflate the stellar envelope considerably implying an increase of pulsation periods. Thus periods derived from a linear analysis may differ significantly from periods obtained in the nonlinear regime. The relevance of this effect for the interpretation of the variability observed in the Wolf-Rayet star WR123 is discussed. Associated with strange-mode pulsations are velocity amplitudes of the order of 100 km/sec and a mean photospheric acoustic energy flux which is comparable to the kinetic energy flux observed in winds of massive stars.
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