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Titolo: Excitation of stellar p-modes by turbulent convection I. Theoretical formulation
Autore: Samadi, R; Goupil, MJ;
- Indirizzi:
- Observ Paris, DESPA, CNRS, UMR 8632, F-92195 Meudon, France Observ Paris Meudon France F-92195 NRS, UMR 8632, F-92195 Meudon, France Univ London Queen Mary & Westfield Coll, Astron Unit, London E1 4NS, England Univ London Queen Mary & Westfield Coll London England E1 4NS S, England Observ Paris, CNRS, DASGAL, UMR 8633, F-92195 Meudon, France Observ ParisMeudon France F-92195 GAL, UMR 8633, F-92195 Meudon, France
- Titolo Testata:
- ASTRONOMY AND ASTROPHYSICS
fascicolo: 1,
volume: 370,
anno: 2001,
pagine: 136 - 146
- SICI:
- 0004-6361(200104)370:1<136:EOSPBT>2.0.ZU;2-X
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- MIXING-LENGTH THEORY; SOLAR GRANULATION; OSCILLATIONS; GENERATION; STARS;
- Keywords:
- convection; turbulence; stars : oscillations; Sun : oscillations;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 33
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Samadi, R Observ Paris, DESPA, CNRS, UMR 8632, F-92195 Meudon, France Observ Paris Meudon France F-92195 632, F-92195 Meudon, France
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- Citazione:
- R. Samadi e M.J. Goupil, "Excitation of stellar p-modes by turbulent convection I. Theoretical formulation", ASTRON ASTR, 370(1), 2001, pp. 136-146
Abstract
Stochatic excitation of stellar oscillations by turbulent convection is investigated and an expression for the power injected into the oscillations by the turbulent convection of the outer layers is derived which takes into account excitation through turbulent Reynolds stresses and turbulent entropy fluctuations. This formulation generalizes results from previous works and is built so as to enable investigations of various possible spatial and temporal spectra of stellar turbulent convection. For the Reynolds stress contribution and assuming tile Kolmogorov spectrum we obtain a similar formulation to those derived by previous authors. The entropy contribution to excitation is found to originate from the advection of the Eulerian entropy fluctuations by the turbulent velocity field. Numerical computations in the solar case in a companion paper indicate that the entropy source term is dominant over the Reynold stress contribution to mode excitation, except at high frequencies.
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Documento generato il 24/05/13 alle ore 17:06:22