Results 21 to 30 of about 345 (250)
Differential rotation and meridional flows in stellar convection zones [PDF]
Proceedings of the International Astronomical Union, 2013 AbstractDifferential rotation and meridional flow are key ingredients in flux transport dynamo models of the solar activity cycle. As the subsurface flow pattern is not sufficiently constrained by observations, it is a major source of uncertainty in solar and stellar dynamo models.
Manfred Küker, Günther Rüdiger
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Hunting for giant cells in stellar convection zones [PDF]
Astrophysical Dynamics: from Stars to Galaxies, IAU Symposium 271, 2010 Abstract3D high resolution simulations for the convective zone of a 4Myr old 0.7 M⊙ pre-main sequence star in gravitational contraction are carried out with different radial density contrast using the pseudo spectral ASH code (Brun et al. 2004). We extract giant cells signal from the complex surface convective patterns by using a wavelet analysis.
Bessolaz & Brun, A.S.
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Low-frequency Internal Gravity Waves Are Pseudo-incompressible
The Astrophysical Journal, 2023 Starting from the fully compressible fluid equations in a plane-parallel atmosphere, we demonstrate that linear internal gravity waves are naturally pseudo-incompressible in the limit that the wave frequency ω is much less than that of surface gravity ...
Bradley W. Hindman, Keith Julien
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Diamagnetic pumping near the base of a stellar convection zone [PDF]
Astronomische Nachrichten, 2008 AbstractThe property of inhomogeneous turbulence in conducting fluids to expel large‐scale magnetic fields in the direction of decreasing turbulence intensity is shown as important for the magnetic field dynamics near the base of a stellar convection zone.
Kitchatinov, L. L., Rüdiger, G.
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The Effect of Convection in Nonlinear One-Zone Stellar Models [PDF]
International Astronomical Union Colloquium, 1993 AbstractWe study the convective nonlinear one-zone models of the pulsating variable stars. In the small convective case, the solution shows chaotic behavior through the period doubling bifurcation as the temperature is lower although the temperature at which the chaos appears is lower than in the case of no convection.
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Convection Theory and Relevant Problems in Stellar Structure, Evolution, and Pulsational Stability I Convection Theory and Structure of Convection Zone and Stellar Evolution [PDF]
Frontiers in Astronomy and Space Sciences, 2021 A non-local and time-dependent theory of convection was briefly described. This theory was used to calculate the structure of solar convection zones, the evolution of massive stars, lithium depletion in the atmosphere of the Sun and late-type dwarfs, and stellar oscillations (in Part Ⅱ).
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The Astrophysical Journal, 2023 Many of the M-dwarf stars, though they are tiny and dim, are observed to possess strong surface magnetic fields and exhibit remarkably intense flaring. Such magnetism may severely impact habitability on the exoplanets now discovered nearby. The origin of
Connor P. Bice, Juri Toomre
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THE SENSITIVITY OF CONVECTION ZONE DEPTH TO STELLAR ABUNDANCES: AN ABSOLUTE STELLAR ABUNDANCE SCALE FROM ASTEROSEISMOLOGY [PDF]
The Astrophysical Journal, 2012 The base of the convection zone is a source of acoustic glitches in the asteroseismic frequency spectra of solar-like oscillators, allowing one to precisely measure the acoustic depth to the feature. We examine the sensitivity of the depth of the convection zone to mass, stellar abundances, and input physics, and in particular, the use of a measurement
van Saders, Jennifer L. +1 more
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27. On meridional circulations in stellar convective zones [PDF]
Symposium - International Astronomical Union, 1958 It is shown in outline by a discussion of the equation of motion in all its components and by taking regard of the geometrical properties of turbulent exchange, that in general the state of pure rotation (without meridional circulations) is not a possible stationary state of motion for convective zones of stars.
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Modeling turbulent stellar convection zones: Sub-grid scales effects [PDF]
Advances in Space Research, 2016 21 pages, 6 figures, accepted for publication in Advances in Space ...
Strugarek, A. +5 more
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