Results 1 to 10 of about 345 (250)
Latitudinal Propagation of Thermal Rossby Waves in Stellar Convection Zones
The Astrophysical Journal, 2023 Using an analytic model, we derive the eigenfrequencies for thermal Rossby waves that are trapped radially and latitudinally in an isentropically stratified atmosphere. We ignore the star’s curvature and work in an equatorial f-plane geometry.
Rekha Jain, Bradley W. Hindman
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MERIDIONAL CIRCULATION IN SOLAR AND STELLAR CONVECTION ZONES [PDF]
Astrophysical Journal, 2015 23 pages, 14 Figures, Submitted to the Astrophysical ...
Mark Miesch
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HUNTING FOR GIANT CELLS IN DEEP STELLAR CONVECTIVE ZONES USING WAVELET ANALYSIS [PDF]
Astrophysical Journal, 2011 We study the influence of stratification on stellar turbulent convection near the stellar surface and in depth by carrying out 3D high resolution hydrodynamic simulations with the ASH code. Four simulations with different radial density contrast corresponding to different aspect ratio for the same underlying 4 Myr $0.7 M_\odot$ pre-main sequence star ...
Bessolaz, N. & Brun, A. S.
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Convective dynamics in mantle of tidally-locked exoplanets [PDF]
Nature CommunicationsTidal locking imposes distinctive thermal forcing on super-Earth exoplanets in habitable zones, i.e., permanent stellar flux forces extraordinary day-night temperature contrast.
Daisuke Noto +4 more
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Convective Boundary Mixing in Main-Sequence Stars: Theory and Empirical Constraints
Galaxies, 2023 The convective envelopes of solar-type stars and the convective cores of intermediate- and high-mass stars share boundaries with stable radiative zones.
Evan H. Anders, May G. Pedersen
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The Run of Superadiabaticity in Stellar Convection Zones. I. The Sun [PDF]
Astrophysical Journal, 1997 The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the usual mixing length approximation (MLA) overestimates the convective efficiency in the SAL.
Demarque, P. +2 more
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Linear Convective Modes and the Energy Transport in Stellar Convection Zones
Astrophysical Journal, 1973 Model stars whose convection zones had been prepared in accordance with the standard mixing-length theory were used as a basis for the computation of unstable convective modes. It was found that no superposition of statistically independent, nonviscous, adiabatic, convective modes can reproduce the radial dependence of the convective flux of the model.
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Seismic measurements of the helium abundance and the depth of stellar convection zones [PDF]
Monthly Notices of the Royal Astronomical Society, 1993 A new inversion technique is presented for measuring the depth of stellar convection zones and the helium abundance from oscillation frequencies of low-degree modes. It is based on a linearized variational principle for stellar oscillations, reformulated in terms of a parameter of convective stability (which is proportional to the radial gradient of ...
Alexander Kosovichev
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The Effects of Radially Varying Diffusivities on Stellar Convection Zone Dynamics
The Astrophysical JournalConvection is ubiquitous in stellar and planetary interiors, where it likely plays an integral role in the generation of magnetic fields. As the interiors of these objects remain hidden from direct observation, numerical models of convection are an ...
Brandon J. Lazard +2 more
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Off-centre convective zones in mass accreting stellar models
Astronomy and AstrophysicsWe report the physical origin of transient off-centre convective zones (oCZs) that arise in mass accreting stellar models. Using detailed MESA simulations of binary evolution, we find that these oCZs are not numerical artefacts, but emerge due to a local increase in density near the retreating edge of the convective core. The density enhancement raises
Amadeusz Miszuda
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