Results 51 to 60 of about 487,950 (322)

Opacity Effects on Pulsations of Main-Sequence A-Type Stars

Atoms, 2018
Opacity enhancements for stellar interior conditions have been explored to explain observed pulsation frequencies and to extend the pulsation instability region for B-type main-sequence variable stars.
Joyce A. Guzik, Christopher J. Fontes, Chris Fryer   +2 more
doaj   +1 more source

Radiative transfer and the energy equation in SPH simulations of star formation [PDF]

, 2007
We introduce and test a new and highly efficient method for treating the thermal and radiative effects influencing the energy equation in SPH simulations of star formation.
A. P. Whitworth, Alexander, Attwood, Bate, Bate, Bell, Black, Boley, Bonnell, Boss, Boss, Boss, D. Stamatellos, Gingold, Goodwin, Goodwin, Hubber, Hubeny, Iglesias, Kitsionas, Klein, Larson, Larson, Larson, Low, Lucy, Masunaga, Masunaga, Masunaga, Mayer, Monaghan, Monaghan, Oxley, Preibisch, S. Goodwin, Spiegel, Stamatellos, Stamatellos, T. Bisbas, Truelove, Viau, Whitehouse, Whitehouse, Whitehouse, Whitworth, Whitworth   +45 more
core   +3 more sources

Opacities for the solar radiative interior

The Astrophysical Journal, 1991
Opacities for the solar radiative interior are computed and compared to previous calculations. A significant enhancement of the Rosseland mean opacity near the bottom of the convection zone is reported when compared to the Los Alamos Astrophysical Opacity Library. The discrepancy is attributed mainly to the equation of state.
C. A. Iglesias, F. J. Rogers
openaire   +1 more source

An Expanded Set of Los Alamos OPLIB Tables in MESA: Type-1 Rosseland-mean Opacities and Solar Models

The Astrophysical Journal
We present a set of 1194 Type-1 Rosseland-mean opacity tables for four different metallicity mixtures. These new Los Alamos OPLIB atomic radiative opacity tables are an order of magnitude larger in number than any previous opacity table release, and span
Ebraheem Farag, Christopher J. Fontes, F. X. Timmes, Earl P. Bellinger, Joyce A. Guzik, Evan B. Bauer, Suzannah R. Wood, Katie Mussack, Peter Hakel, James Colgan, David P. Kilcrease, Manolo E. Sherrill, Tryston C. Raecke, Morgan T. Chidester   +13 more
doaj   +1 more source

New single-valued-parameters radiative accelerations of Sc and Ni for modelling stellar interiors

Astronomy & Astrophysics
Context. The precise evaluation of the radiative accelerations of chemical elements in stars is critical since these accelerations are often the principal contributor to atomic diffusion. Atomic diffusion causes the migration of elements inside stars and
Alecian G., LeBlanc F., Hui-Bon-Hoa A.
doaj   +1 more source

3D LTE spectral line formation with scattering in red giant stars [PDF]

, 2011
We investigate the effects of coherent isotropic continuum scattering on the formation of spectral lines in local thermodynamic equilibrium (LTE) using 3D hydrodynamical and 1D hydrostatic model atmospheres of red giant stars.
Allen de Prieto, Anstee, Asplund, Asplund, Asplund, Asplund, Asplund, Asplund, Asplund, Auer, Auer, Barklem, Barklem, Barklem, Barklem, Barklem, Barklem, Barklem, Beers, Behara, Bihain, Caffau, Cayrel, Cayrel, Collet, Collet, Dravins, Dravins, Eidelsberg, Feautrier, González Hernández, Hayek, Huang, Hui, Kiselman, Lai, Ludwig, M. Asplund, Marquette, Nordlund, Nordlund, Olson, Pereira, Pereira, R. Collet, Ruscic, Sauval, Sbordone, Skartlien, Spite, Steffen, Stein, Trujillo Bueno, Uitenbroek, Urdahl, W. Hayek, Å. Nordlund   +56 more
core   +2 more sources

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

Advanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner, Ruben Maile, Murat Cuvalli, Andreas Wolf, Ayisha Komal, Robert Oestreich, Christoph Janiak, Karl Mandel, Alexander Knebel, Klaus Müller‐Buschbaum   +9 more
wiley   +1 more source

High-Temperature Processing of Solids Through Solar Nebular Bow Shocks: 3D Radiation Hydrodynamics Simulations with Particles [PDF]

, 2013
A fundamental, unsolved problem in Solar System formation is explaining the melting and crystallization of chondrules found in chondritic meteorites.
Boley, A. C., Desch, S. J., Morris, M. A.   +2 more
core   +1 more source

Biodegradable and Recyclable Luminescent Mixed‐Matrix‐Membranes, Hydrogels, and Cryogels based on Nanoscale Metal‐Organic Frameworks and Biopolymers

Advanced Functional Materials, EarlyView.
The study presents biodegradable and recyclable mixed‐matrix membranes (MMMs), hydrogels, and cryogels using luminescent nanoscale metal‐organic frameworks (nMOFs) and biopolymers. These bio‐nMOF‐MMMs combine europium‐based nMOFs as probes for the status of the materials with the biopolymers agar and gelatine and present alternatives to conventional ...
Moritz Maxeiner, Julian Burkhart, Kateryna Borysova, Chiara Mazzariol, Klaus Müller‐Buschbaum   +4 more
wiley   +1 more source

Irradiated Atmospheres. III. Radiative-convective-mixing Equilibrium for Nongray Picket-fence Model

The Astrophysical Journal
The nongray picket-fence model predicts more accurately the temperatures in low-density regions compared to semigray models. This study investigates how the vertical-mixing and convection fluxes modify the picket-fence model.
Wei Zhong, Zhen-Tai Zhang, Bo Ma, Xianyu Tan, Dong-dong Ni, Cong Yu   +5 more
doaj   +1 more source