Results 31 to 40 of about 88,144 (207)

New Results on Standard Solar Models

, 2009
We describe the current status of solar modelling and focus on the problems originated with the introduction of solar abundance determinations with low CNO abundance values.
A. Weiss, Aldo M. Serenelli, B. Aharmim, B. Aharmim, C. Allende Prieto, C. Arpesella, C. Fröhlich, C.H. Lin, F. Delahaye, H.M. Antia, H.M. Antia, I.W. Roxburgh, J. Guzik, J.A. Guzik, J.C. Christensen-Dalsgaard, J.C. Christensen-Dalsgaard, J.C. Christensen-Dalsgaard, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.W. Ferguson, M. Asplund, M. Castro, N. Grevesse, N. Grevesse, N.R. Badnell, Q.R. Ahmad, S. Basu, S. Basu, S. Basu, S. Turck-Chiéze, W.C. Haxton, W.J. Chaplin   +37 more
core   +1 more source

The Stochastic‐Dissipative Störmer Problem‐Trajectories and Radiation Patterns

Annalen der Physik, EarlyView.
We consider charged particle motion and radiation in a dipole magnetic field, in the presence of friction and of stochastic forces. The numerical solutions of the Langevin equation reveal how these forces modify the complex dynamics of particles, and they offer some new insights into the nonlinear processes relevant to planetary radiation belts ...
Tiberiu Harko, Gabriela Raluca Mocanu
wiley   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, EarlyView.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Recent Advances in Modeling Stellar Interiors

, 2010
Advances in stellar interior modeling are being driven by new data from large-scale surveys and high-precision photometric and spectroscopic observations.
A. Baglin, A. Dotter, A. Dotter, A. Formicola, A. Grigahcéne, A. Miglio, A. Noels, A. Pigulski, A. Thoul, A.N. Cox, A.S. Brun, A.S. Brun, A.S. Brun, A.Y. Potekhin, C. Angulo, C. Paquette, C. Paquette, C.A. Iglesias, C.A. Meakin, C.W. Straka, D. Arnett, D. Arnett, D. Mao, D. Mihalas, D.B. Alexander, D.D. Clayton, D.S.P. Dearborn, E.E. Salpeter, E.G. Adelberger, F.J. Rogers, G.R. Caughlan, H. Hu, H. Hu, H.A. Kassim, I. Iben Jr., I. Soszyński, J. Christensen-Dalsgaard, J. Christensen-Dalsgaard, J. Daszyńska-Daszkiewicz, J. Daszyńska-Daszkiewicz, J. Ferguson, J.A. Guzik, J.A. Guzik, J.A. Guzik, J.M. Burgers, J.M. Matthews, Joyce Ann Guzik, K. Mussack, K. Ogata, L.H. Li, L.H. Li, M. Asplund, M. Asplund, M. Mocák, M. Mocák, M.J. Seaton, N. Gai, N. Grevesse, N. Itoh, N. Itoh, N. Itoh, N. Magee, N. Smith, N.J. Shaviv, N.R. Badnell, P. Kippenhahn, P. Lenz, P. Ventura, P.P. Eggleton, R. Gilliland, R.F. González, R.G. Deupree, R.G. Deupree, R.G. Deupree, R.G. Deupree, R.G. Deupree, R.G. Deupree, R.G. Deupree, Rodrǵuez-López, S. Basu, S. Cassisi, S. Cassisi, S. Randall, S. Theado, S. Turcotte, S. Turcotte, T. Zdravkov, T. Zdravkov, T. Zdravkov, W. Dappen, W.B. Hubbard   +90 more
core   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, EarlyView.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Precision Stellar Astrophysics in the Kepler Era

, 2016
The study of fundamental properties (such as temperatures, radii, masses, and ages) and interior processes (such as convection and angular momentum transport) of stars has implications on various topics in astrophysics, ranging from the evolution of ...
Huber, Daniel
core   +1 more source

Modelling Thomson Scattering in a Hydrogen Plasma at Stellar Interior Conditions Using the Hypernetted‐Chain Approach

Contributions to Plasma Physics, EarlyView.
ABSTRACT Under the extreme conditions found in small stars, where electron degeneracy and Coulomb coupling are significant, accurate modeling of Thomson scattering is crucial for determining opacity, a primary quantity for stellar energy transport.
Samuel Schumacher, Julian Lütgert, Dirk O. Gericke, Mandy Bethkenhagen, Tilo Döppner, Otto L. Landen, Nathaniel R. Shaffer, Charles E. Starrett, Dominik Kraus   +8 more
wiley   +1 more source

The nature and formation of silica minerals in eucrite meteorites: Insight into the protoplanetary magma crystallization

Meteoritics &Planetary Science, EarlyView.
Abstract Silica polymorphs in meteorites provide critical constraints on crystallization processes associated with thermal activity in the early solar system. A detailed investigation of silica polymorphs in eucrites (the largest group of achondrites) using cathodoluminescence imaging and laser‐Raman spectroscopy revealed significant variations in the ...
Rei Kanemaru, Akira Yamaguchi, Naoya Imae, Ryoga Maeda, Makoto Kimura, Kenji Horie, Takashi Mikouchi, Masaaki Miyahara, Masahiro Yasutake, Atsushi Takenouchi, Haruka Ono, Aiko Nakato, Junko Isa, Tomohiro Usui, Hirotsugu Nishido   +14 more
wiley   +1 more source

Analysis of stellar spectra with 3D and NLTE models

, 2014
Models of radiation transport in stellar atmospheres are the hinge of modern astrophysics. Our knowledge of stars, stellar populations, and galaxies is only as good as the theoretical models, which are used for the interpretation of their observed ...
A Chiavassa, A Chiavassa, A Vögler, B Beeck, B Freytag, B Freytag, B Gustafsson, B Paxton, BV Gudiksen, CI Short, CI Short, D Mihalas, D Mihalas, D Teyssier, DF Buscher, DF Gray, E Baron, E Böhm-Vitense, E Caffau, F Grupp, H Uitenbroek, HC Spruit, HG Ludwig, HJ Muthsam, J Reetz, JD Tanner, JS Young, K Lind, K Ohnaka, LB Lucy, LH Auer, M Asplund, M Asplund, M Bergemann, M Bergemann, M Bergemann, M Bergemann, M Carlsson, M Carlsson, NG Shchukina, P Kervella, P Laverny de, PE Tremblay, PG Tuthill, PH Hauschildt, R Alvarez, R Cayrel, R Collet, R Collet, R Trampedach, RF Stein, RL Kurucz, RL Kurucz, RW Wilson, RW Wilson, S Höfner, T Merle, T Murphy, VH Hansteen, VM Canuto, W Hayek, X Haubois, Z Magic, Å Nordlund, Å Nordlund   +64 more
core   +1 more source

Solar and Stellar Dynamos [PDF]

, 2013
1 Magnetohydrodynamics.- 2 Decay and Amplification of Magnetic Fields.- 3 Dynamo Models of the Solar Cycle.- 4 Fluctuations, Intermittency and Predictivity.- 5 Stellar Dynamos.- A Useful Identities and Theorems from Vector Calculus.- B Coordinate Systems and the Fluid Equations.- C Physical and Astronomical Constants.- D Maxwell's Equations and ...
openaire   +2 more sources