Results 31 to 40 of about 9,183 (293)

HUNTING FOR GIANT CELLS IN DEEP STELLAR CONVECTIVE ZONES USING WAVELET ANALYSIS [PDF]

The 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.
openaire   +3 more sources

Constraining mixing processes in stellar cores using asteroseismology. Impact of semiconvection in low-mass stars

, 2011
The overall evolution of low-mass stars is heavily influenced by the processes occurring in the stellar interior. In particular, mixing processes in convectively unstable zones and overshooting regions affect the resulting observables and main sequence ...
A. M. Serenelli, A. Weiss, Aerts, Angulo, Antia, Audard, Audard, Ballot, Basu, Basu, Brandão, Canuto, Chaplin, Christensen-Dalsgaard, Christensen-Dalsgaard, Christensen-Dalsgaard, Christensen-Dalsgaard, Christensen-Dalsgaard, Christensen-Dalsgaard, Christensen-Dalsgaard, Cowling, Crowe, Cunha, Cunha, Cunha, de Meulenaer, Deheuvels, Deheuvels, Dintrans, Dziembowski, Faulkner, Ferguson, Floranes, Freytag, Gabriel, Gai, Godart, Grevesse, Grossman, Herwig, Hummer, Iglesias, J. Ballot, Kato, Langer, Langer, Langer, Lebreton, Lebreton, Ledoux, Maeder, Maeder, Maeder, Magic, Mazumdar, Mazumdar, Merryfield, Metcalfe, Michel, Miglio, Mitalas, Monteiro, Monteiro, Monteiro, Noels, Pietrinferni, Popielski, Provost, Rogers, Rogers, Roxburgh, Roxburgh, Roxburgh, Roxburgh, Roxburgh, Roxburgh, Roxburgh, Saio, Schwarzschild, Spruit, Stello, Stello, Stevenson, Stothers, Stothers, Straka, Takata, Takata, Thoul, Turcotte, V. Silva Aguirre, VandenBerg, VandenBerg, Weiss, Zahn, Zahn   +95 more
core   +1 more source

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

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

X-rays in the Orion Nebula Cluster: Constraints on the origins of magnetic activity in pre-main sequence stars [PDF]

, 2002
A recent Chandra/ACIS observation of the Orion Nebula Cluster detected 1075 sources (Feigelson et al. 2002), providing a uniquely large and well-defined sample to study the dependence of magnetic activity on bulk properties for stars descending the ...
Alcala J. M., Birk G. T., Bouvier J., Bouvier J., Bouvier J., Delfosse X., Dudorov A. E., D’Antona F., Eric D. Feigelson, Flaccomio E., Gondoin P., Gordon Garmire, Granzer T., Houdebine E. R., Huensch M., James A. Gaffney III, Jardine M., Kitchatinov L. L., Kitchatinov L. L., Koyama K., Kuker M., Kuker M., Leisa Townsley, Lynne A. Hillenbrand, McGill R., Moss D., Mullan D. J., Neuhauser R., Pizzolato N., Preibisch T., Randich S., Stepien K., Tayler R. J., Wichmann R.   +33 more
core   +3 more sources

Active Carbon and Oxygen Shell Burning Hydrodynamics

, 2006
We have simulated 2.5$\times10^3$ s of the late evolution of a $23 \rm M_\odot$ star with full hydrodynamic behavior. We present the first simulations of a multiple-shell burning epoch, including the concurrent evolution and interaction of an oxygen and ...
Casey A. Meakin, David Arnett, Langer N., Spruit H. C., Stevenson D. J.   +4 more
core   +1 more source

Turbulent Convection in Stellar Interiors. II. The Velocity Field

, 2008
We analyze stellar convection with the aid of 3D hydrodynamic simulations, introducing the turbulent cascade into our theoretical analysis. We devise closures of the Reynolds-decomposed mean field equations by simple physical modeling of the simulations (
Arnett, Asida, Balbus, Batchelor, Bethe, Biermann, Boris, Brandenburg, Browning, Browning, Böhm-Vitense, Böhm-Vitense, Campbell, Casey Meakin, Chandrasekhar, Chandrasekhar, Charbonnel, Clayton, Cvitanović, David Arnett, Dutton, Frisch, Gill, Gleick, Hansen, Heger, Howe, Kippenhahn, Kolmogorov, Kritsuk, Landau, Ludwig, Meakin, Meakin, Meakin, Meynet, Nordlund, Oran, Patrick A. Young, Porter, Porter, Shannon, Stone, Sytine, Tassoul, Tennekes, Thompson, Timmes, Trampedach, Tritton, Turner, Vitense, Woodward, Woodward, Young, Zel'dovich   +55 more
core   +1 more source

Differential Rotation in Stellar Convection Zones

The Astrophysical Journal, 1970
The analysis of an earlier paper (Busse l970a) in which the differential rotation of the Sun was explained as the result of large scale convection in the solar convection zone is extended to include the detailed spatial dependence of the meridional circulation as well as of the differential rotation.
openaire   +1 more source

Modelling Time-dependent Convective Penetration in 1D Stellar Evolution

The Astrophysical Journal
One-dimensional stellar evolution calculations produce uncertain predictions for quantities like the age, core mass, core compactness, and nucleosynthetic yields; a key source of uncertainty is the modeling of interfaces between regions that are ...
Cole Johnston, Mathias Michielsen, Evan H. Anders, Mathieu Renzo, Matteo Cantiello, P. Marchant, Jared A. Goldberg, Richard H. D. Townsend, Gautham Sabhahit, Adam S. Jermyn   +9 more
doaj   +1 more source