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《Acta Astronomica Sinica》 2017-02
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Turbulent Convection and Pulsation Stability of Stars

XIONG Da-run;Purple Mountain Observatory,Chinese Academy of Sciences;  
The controversies about the excitation mechanism for cool variables are reviewed:(1)Most people believe that γ Doradus stars are excited by so called convective blocking. Our researches show that the excitation of γ Doradus has no difference from that of δ Scuti. They are two subgroups of a broader type of δ Stuti-γ Doradus stars: δ Scuti is the p-mode subgroup,while γ Doradus is the g-mode subgroup.(2)Most people believe that the Solar-and Solar-like oscillations of stars are damped by convection,and they are excited by so called stochastic effects of turbulence. Our researches show that convection is not solely a damping mechanism for stellar oscillations,otherwise it is not able to explain the excitation of Mira and Mira-like stars. It can be repeated not only the δ Scuti and γ Doradus strip,but also the characteristics of Solar-like and Mira-like oscillations,respectively,for the low-and high-luminosity red stars by using our non-local and time-dependent theory of convection.
【Fund】: 国家自然科学基金项目(AO11373069)资助
【CateGory Index】: P145.2
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