Regular and Irregular Pulsations of Luminous Blue Variables
The evolution of massive stars in the range from 20 M⊙ to about 60 M⊙ leads through oscillatory unstable phases during their core hydrogen as well as during the early core helium burning stages. Large-scale, nonlinear pulsations with periods around one day can develop and lead to shock waves travelling through the stellar atmosphere. Ballistic motions of the outermost layers on the dynamic time scale of the atmosphere are interrupted by strong compressional shock waves. The deposition of energy and momentum leads to atmospheric stratifications that differ significantly from what prevails if hydrostatic stratification is assumed
KeywordsStellar pulsations radiation hydrodynamics variable stars
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