Results 41 to 50 of about 42,668 (331)

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
openaire   +1 more source

Global-scale wreath-building dynamos in stellar convection zones [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractWhen stars like our Sun are young they rotate rapidly and are very magnetically active. We explore dynamo action in rapidly rotating suns with the 3-D MHD anelastic spherical harmonic (ASH) code. The magnetic fields built in these dynamos are organized on global-scales into wreath-like structures that span the convection zone.
Brown, B. P., Browning, M. K., Brun, A. S., Miesch, M. S., Toomre, Juri   +9 more
openaire   +2 more sources

Asteroseismic signatures of helium gradients in late F-type stars [PDF]

, 2006
Element diffusion is expected to occur in all kinds of stars : according to the relative effect of gravitation and radiative acceleration, they can fall or be pushed up in the atmospheres.
Alexander, Angulo, Bazot, Brassard, Böhm-Vitense, Däppen, Iglesias, M. Castro, Michaud, Paquette, Richard, Roxburgh, S. Vauclair, Théado, Vauclair   +14 more
core   +5 more sources

Excitation of transverse magnetic tube waves in stellar convection zones [PDF]

Astronomy & Astrophysics, 2002
In the previous two papers of this series, we developed an analytical method describing the generation of transverse tube waves in stellar convection zones and used it to compute the wave energy spectra and fluxes for late-type stars with the solar metal abundance (population I stars).
Z. E. Musielak, P. Ulmschneider
openaire   +3 more sources

Convective cores in galactic cooling flows [PDF]

, 2000
We use hydrodynamic simulations with adaptive grid refinement to study the dependence of hot gas flows in X-ray luminous giant elliptical galaxies on the efficiency of heat supply to the gas. We consider a number of potential heating mechanisms including
Alexei Kritsuk, Arimoto, Batchelor, Berger, Binney, Brighenti, Buote, Böhringer, Cappellaro, Colella, Davis, Ewald Müller, Faber, Fabian, Fujita, Harris, Heinz, Hunter, Hurlburt, Koekemoer, Kritsuk, Kritsuk, Kritsuk, Kritsuk, Loewenstein, Loewenstein, Mathews, Mathews, McNamara, Nulsen, Nulsen, Owen, Plewa, Porter, Press, Sarazin, Sutherland, Thomas, Thomas, Tomasz Plewa, van den Bergh   +40 more
core   +5 more sources

A Model of Rotating Convection in Stellar and Planetary Interiors. II. Gravito-inertial Wave Generation [PDF]

Astrophysical Journal, 2020
Gravito-inertial waves are excited at the interface of convective and radiative regions and by the Reynolds stresses in the bulk of the convection zones of rotating stars and planets.
K. Augustson, S. Mathis, A. Astoul
semanticscholar   +1 more source

Optical, UV, and X-ray evidence for a 7-yr stellar cycle in Proxima Centauri [PDF]

, 2016
Stars of stellar type later than about M3.5 are believed to be fully convective and therefore unable to support magnetic dynamos like the one that produces the 11-year solar cycle.
B. Wargelin, S. Saar, G. Pojma'nski, J. Drake, V. Kashyap   +4 more
semanticscholar   +1 more source

Excitation of transverse magnetic tube waves in stellar convection zones [PDF]

Astronomy & Astrophysics, 2001
Analytical treatment of the excitation of transverse magnetic tube waves in stellar convection zones is presented. The waves are produced by the interaction between thin and vertically oriented magnetic flux tubes embedded in stellar convection zones and the external turbulent motions.
Z. E. Musielak, P. Ulmschneider
openaire   +1 more source

Gyroscopic pumping of large-scale flows in stellar interiors, and application to Lithium Dip stars

, 2010
The maintenance of large-scale differential rotation in stellar convective regions by rotationally influenced convective stresses also drives large-scale meridional flows by angular--momentum conservation.
Anthony-Twarog, Bodenheimer, Boesgaard, Boesgaard, Deliyannis, Garaud, Garaud, Garaud, Garaud, Kundu, P. Bodenheimer, P. Garaud, Rüdiger, Schou, Spiegel, Talon, Talon, Zahn   +17 more
core   +1 more source

Supernova Ia: a Converging Delayed Detonation Wave [PDF]

, 2001
A model of a carbon-oxygen (C--O) presupernova core with an initial mass 1.33 M_\odot, an initial carbon mass fraction 0.27, and with an average mass growth-rate 5 x 10^{-7} M_\odot/yr due to accretion in a binary system was evolved from initial central ...
A. M. Khokhlov, A. M. Lisewski, B. Paczyński, D. G. Yakovlev, E. E. Salpeter, E. E. Salpeter, G. S. Bisnovatyi-Kogan, I. Hachisu, I. Iben, J. C. Niemeyer, K. Nomoto, L. D. Landau, L. N. Ivanova, L. N. Ivanova, L. N. Ivanova, L. N. Ivanova, L. N. Ivanova, L. R. Yungel’son, M. Haft, N. V. Dunina-Barkovskaya, N. V. Dunina-Barkovskaya, N. V. Zmitrenko, P. J. Schinder, S. E. Woosley, S. E. Woosley, S. I. Blinnikov, S. I. Blinnikov, S. I. Blinnikov, S. I. Blinnikov, S. I. Blinnikov, S. I. Blinnikov, S. I. Blinnikov, V. S. Imshennik, V. S. Imshennik, V. S. Imshennik, W. D. Arnett, W. Fowler   +36 more
core   +3 more sources