scholarly journals Turbulent convection and pulsation stability of stars – II. Theoretical instability strip forδScuti andγDoradus stars

2016 ◽  
Vol 457 (3) ◽  
pp. 3163-3177 ◽  
Author(s):  
D. R. Xiong ◽  
L. Deng ◽  
C. Zhang ◽  
K. Wang
Keyword(s):  
Turbulent Convection ◽  
Instability Strip ◽  
Stability Of Stars ◽  
Pulsation Stability

Pulsation Stability of Stars in Thermal Imbalance. III. Analysis in Terms of Absolute Variations

1974 ◽  
Vol 191 ◽  
pp. 439 ◽  
Author(s):  
John P. Cox ◽  
William R. Davey ◽  
Morris L. Aizennum
Keyword(s):  
Stability Of Stars ◽  
Thermal Imbalance ◽  
Pulsation Stability

Influence of Convection on the Pulsational Stability of Stars

1981 ◽  
Vol 93 ◽  
pp. 278-279
Author(s):  
Y. Osaki ◽  
G. Gonczi
Keyword(s):  
Time Dependent ◽  
Phase Lag ◽  
Instability Strip ◽  
Convective Flux ◽  
Local Character ◽  
Spatial Oscillations ◽  
Stability Of Stars ◽  
Mixing Length Theory ◽  
Astronomy And Astrophysics ◽  
Pulsational Stability

Influence of convection on the pulsational stability of stars is examined based on Unno's (1967) theory of time-dependent convection. This theory is an extension of Vitense's local mixing-length theory of convection to the time-dependent problem. The equations of linear non-adiabatic pulsations, which include the thermal interaction between convection and pulsation, have been solved numerically on a series of Cepheid models. It is found that the thermal eigenfunctions (of δ T/T and δ L/L) exhibit spatial oscillations with short wavelength in cool stellar models where the energy is mostly transported by convection. This phenomenon of spatial oscillations is interpreted, and it is shown that they arise because of the phase lag of the convective flux to pulsation and they are related to the local character of the convection theory. It is found that the spatial oscillations play a determinant role in the pulsational stability in the region of the red edge of the Cepheid instability strip, as far as the thermal convection-pulsation coupling is concerned. The details of this study have been pulbished in Astronomy and Astrophysics.

scholarly journals On the effect of turbulent anisotropy on pulsation stability of stars

2017 ◽  
Vol 17 (3) ◽  
pp. 29 ◽  
Author(s):  
Chun-Guang Zhang ◽  
Li-Cai Deng ◽  
Da-Run Xiong
Keyword(s):  
Stability Of Stars ◽  
Pulsation Stability

scholarly journals Convective Overshooting to Drive g-Modes in γ Dor Stars

2001 ◽  
Vol 203 ◽  
pp. 62-65
Author(s):  
Y. Li
Keyword(s):  
Kinetic Energy ◽  
Energy Input ◽  
Turbulent Convection ◽  
Mass Limit ◽  
Instability Strip ◽  
Convective Envelope ◽  
Stellar Interior ◽  
Low Mass ◽  
Stellar Models ◽  
Convection Parameter

From considerations of kinetic energy input from turbulent convection into g-mode pulsation, we show that g-mode pulsation may obtain enough energy from the turbulence to overcome damping in the stellar interior. The development of thick convective envelope in the stellar models requires a small value of the convection parameter α = 1.2 to ensure the low mass limit of the γ Dor stars' instability strip to be in agreement with the observations.

Wall Laws for Natural Turbulent Convection

1998 ◽  
Vol 29 (4-5) ◽  
pp. 235-242
Author(s):  
B. P. Golovnya
Keyword(s):  
Turbulent Convection
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