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Stellar turbulent convection - A new model and applications
Abstract
Improvements of the mixing-length theory (MLT) of turbulent convection in stellar atmospheres are developed theoretically. It is pointed out that inaccuracies are introduced into MLT by the approximating assumptions of a single large eddy (rather than many eddies of different sizes) and of incompressibility. In the proposed new model, the full spectrum of turbulent eddies is determined using more recent turbulence models (e.g., the eddy-damped quasi-normal Markovian model of Orszag, 1977), and a new formula for the convective flux is obtained which gives values up to 10 times greater than those of the MLT at high convective efficiencies. The problem of compressibility is addressed by adding one of two new expressions (one with no free parameters) for the mixing length. Numerical results from simulations of a solar-type star and a 0.8-solar-mass globular-cluster star are presented in tables and graphs and discussed in detail; the agreement with observations is found to be better than with the MLT.
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Citations
Cited by
Evolution of Asymptotic Giant Branch Stars
Herwig, F. (2005) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.43.072103.150600 · Cited by 1,051
Simulations of Solar Granulation. I. General Properties
Stein, R. F., & Nordlund, A. (1998) · The Astrophysical Journal · doi:10.1086/305678 · Cited by 744
Accurate masses and radii of normal stars
Andersen, J. (1991) · The Astronomy and Astrophysics Review · doi:10.1007/bf00873538 · Cited by 675
Predictions for Self-Pollution in Globular Cluster Stars
Ventura, P., D’Antona, F., Mazzitelli, I., & Gratton, R. (2001) · The Astrophysical Journal · doi:10.1086/319496 · Cited by 448
Self-citationAn Assessment of Dynamical Mass Constraints on Pre–Main‐Sequence Evolutionary Tracks
Hillenbrand, L. A., & White, R. J. (2004) · The Astrophysical Journal · doi:10.1086/382021 · Cited by 319
Metadata
- Authors
- Canuto, V. M., & Mazzitelli, I.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1991-03
- Volume
- 370
- Pages
- 295
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2049561256
- Cited by
- 565
- References
- 0
- FWCI
- 12.16
- Type
- journal article
- Language
- en
- Open access
- closed
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