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| Paper: |
On the Turbulence Variation in the Atmosphere of Delta Cephei |
| Volume: |
135, A Half Century of Stellar Pulsation Interpretations: a Tribute to Arthur N. Cox |
| Page: |
184 |
| Authors: |
Gillet, D.; Debieve, J.-F.; Fokin, A. B.; Mazauric, S. |
| Abstract: |
In the framework of the two limiting regimes called RincompressibleS and Rpressure releasedS, and expecting that the dissipation is negligible (Rrapid distortionS or RDT case), it is shown that the turbulence amplification in the atmosphere of a radially pulsating star is not only due to the global compression of the atmosphere during the pulsation. Strong shock waves propagating from the deep atmosphere as far as the very low density layers also play a role in the turbulence variation, especially when they become very strong i.e., hypersonic. The predicted turbulence amplification induced by the global star compression is well consistent with the solenodial RDT. Nevertheless the turbulence effect induced by shock wave propagations is not yet well modeled in the framework of the presently non- linear non-adiabatic pulsational model used for the classical Cepheid star d Cephei. |
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