Results 31 to 40 of about 17,712 (190)

Energy Conservation and Gravity Waves in Sound-proof Treatments of Stellar Interiors: Part I Anelastic Approximations

, 2012
Typical flows in stellar interiors are much slower than the speed of sound. To follow the slow evolution of subsonic motions, various sound-proof equations are in wide use, particularly in stellar astrophysical fluid dynamics.
Almgren, Almgren, Barranco, Benjamin P. Brown, Brown, Brown, Brown, Browning, Browning, Brun, Brun, Brun, Brun, Ellen G. Zweibel, Elliott, Geoffrey M. Vasil, Lantz, Lantz, Lighthill, Miesch, Miesch, Nelson, Nonaka, Rempel, Rempel, Rogers, Rogers, Rogers, Zingale   +28 more
core   +1 more source

Stability of toroidal magnetic fields in stellar interiors

, 2015
We present 3D MHD simulations of purely toroidal and mixed poloidal-toroidal magnetic field configurations to study the behavior of the Tayler instability.
Braithwaite, Jonathan, Ibañez-Mejia, Juan C.   +1 more
core   +1 more source

The extent of mixing in stellar interiors: the open clusters Collinder 261 and Melotte 66 [PDF]

, 2016
Context: Determining carbon and nitrogen abundances in red giants provides useful diagnostics to test mixing processes in stellar atmospheres. Aims: Our main aim is to determine carbon-to-nitrogen and carbon isotope ratios for evolved giants in the open ...
Bragaglia, Angela, Drazdauskas, Arnas, Janulis, Rimvydas, Mikolaitis, Šarūnas, Randich, Sofia, Tautvaišienė, Gražina   +5 more
core   +2 more sources

Numerical Simulations Confirm Wave-induced Shear Mixing in Stellar Interiors

The Astrophysical Journal Letters
Internal gravity waves (IGWs) are thought to cause mixing in stellar interiors, a process that has been widely studied both theoretically and numerically.
A. Varghese, R. P. Ratnasingam, L. Ramírez-Galeano, S. Mathis, T. M. Rogers   +4 more
doaj   +1 more source

Stellar hydrodynamics caught in the act: Asteroseismology with CoRoT and Kepler

, 2011
Asteroseismic investigations, particularly based on data on stellar oscillations from the CoRoT and Kepler space missions, are providing unique possibilities for investigating the properties of stellar interiors.
Auvergne, Baglin, Baglin, Baudin, Bazot, Bedding, Blažko, Borucki, Bouchy, Bouchy, Carrier, Catala, Chadid, Charpinet, Christensen-Dalsgaard, Degroote, Deheuvels, Dominik, Dupret, Dziembowski, Fontaine, Frandsen, Gough, Gough, Grundahl, Grundahl, Handler, Hekker, Hekker, Houdek, Huber, Jørgen Christensen-Dalsgaard, Kallinger, Kallinger, Kjeldsen, Kjeldsen, Kolenberg, Kolenberg, Kuschnig, Lamb, Maeder, Mathis, Mathis, Michael J. Thompson, Miesch, Miglio, Miglio, Montalbán, Moskalik, Mosser, Mosser, Palacios, Palacios, Pamyatnykh, Poretti, Smith, Soszyński, Trampedach, Van Grootel   +58 more
core   +1 more source

Primordial Lithium from Globular Cluster Turnoff Stars: M13 and M71

The Astrophysical Journal
During Big Bang nucleosynthesis (BBN) in the first 15 minutes of the Universe, some ^7 Li was created along with isotopes of H and He. The determination of that primordial value of Li can help constrain the conditions at that time.
Ann Merchant Boesgaard, Constantine P. Deliyannis   +1 more
doaj   +1 more source

Rotation and stellar evolution

EPJ Web of Conferences, 2013
The effects of rotation on the evolution and properties of low-mass stars are first discussed from the pre-main sequence to the red giant phase. We then briefly indicate how some observational constraints available for these stars can help us progress in
Eggenberger P.
doaj   +1 more source

Element diffusion in stellar interiors

The Astrophysical Journal, 1990
Simple equations are derived that describe element diffusion in radiative stellar interiors and that may be incorporated in standard stellar evolution codes. For the sun, diffusion is expected to increase the predicted event rates in the Cl-37 solar neutrino experiment and in electron-neutrino scattering experiments by 5 - 10 percent; the expected ...
John N. Bahcall, Abraham Loeb
openaire   +1 more source

Masses of subgiant stars from asteroseismology using the coupling strengths of mixed modes

, 2012
Since few decades, asteroseismology, the study of stellar oscillations, enables us to probe the interiors of stars with great precision. It allows stringent tests of stellar models and can provide accurate radii, masses and ages for individual stars.
Aizenman, Bedding, Bedding, Bedding, Christensen-Dalsgaard, Eggleton, Gough, Grevesse, Kjeldsen, Kurucz, Mathur, Metcalfe, Osaki, Rogers, Stello, Stello, Vandakurov   +16 more
core   +1 more source

Rotating Stellar Interiors (Review Paper) [PDF]

International Astronomical Union Colloquium, 1987
AbstractRotation has two main qualitative effects on the structure of a star: it distorts the shape and it reduces the total luminosity. The luminosity depends only on the total angular momentum but the shape, and so the observable properties, depends on the internal distribution of angular momentum.
openaire   +1 more source