Results 71 to 80 of about 34,048 (260)

The Shapes of Stellar Spectra

Atoms, 2023
Stellar atmospheres separate the hot and dense stellar interiors from the emptiness of space. Radiation escapes from the outermost layers of a star, carrying direct physical information.
Carlos Allende Prieto
doaj   +1 more source

Efficiency of thermal relaxation by radiative processes in protoplanetary discs: constraints on hydrodynamic turbulence

, 2017
Hydrodynamic, non-magnetic instabilities can provide turbulent stress in the regions of protoplanetary discs, where the MRI can not develop. The induced motions influence the grain growth, from which formation of planetesimals begins.
Dullemond, C. P., Henning, Th., Klahr, H., Malygin, M. G., Semenov, D.   +4 more
core   +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

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

Dust Around T Tauri Stars [PDF]

Journal of Astronomy and Space Sciences, 2011
To reproduce the multiple broad peaks and the fine spectral features in the spectral energy distributions (SEDs) of T Tauri stars, we model dust around T Tauri stars using a radiative transfer model for multiple isothermal circumstellar dust shells. We
Kyung-Won Suh, Young-Joo Kwon
doaj   +1 more source

Radiative atomic Rosseland mean opacity tables

The Astrophysical Journal Supplement Series, 1992
For more than two decades the astrophysics community has depended on opacity tables produced at Los Alamos. In the present work we offer new radiative Rosseland mean opacity tables calculated with the OPAL code developed independently at LLNL. We give extensive results for the recent Anders-Grevesse mixture which allow accurate interpolation in ...
Carlos A. Iglesias, Forrest J. Rogers
openaire   +2 more sources

Luminous Blue Variables & Mass Loss near the Eddington Limit

, 2008
During the course of their evolution, massive stars lose a substantial fraction of their initial mass, both through steady winds and through relatively brief eruptions during their Luminous Blue Variable (LBV) phase.
Allard Jan van Marle, Belyanin, Owocki, Stan Owocki   +3 more
core   +1 more source

How to SYN in seven easy steps [PDF]

, 2001
The calculation of expected spectral line strengths and profiles is a powerful tool for the analysis of the solar atmosphere, and other stellar atmospheres.
Anstee, Barklem, Barklem, Holweger, J.E.R. Ross, Kurucz, Mihalas, Nieminen, Nieminen, Peach, Ross, T.A. Nieminen, Thompson   +12 more
core   +2 more sources

Wood Reconfiguration Enables Broadband Blackbody in Large‐Area, Modular, Optically Welded Carbon Constructs

Advanced Functional Materials, EarlyView.
Wood‐based broadband blackbody is achieved by reconfiguration of wood with lignin nanoparticles prior carbonization. Neglectable reflectivity from the visible to infrared wavelengths is obtained by combining thin nanostructures originated from the wood cell walls with long‐range microcavities in the wood lumina.
Bin Zhao, Noora Jäntti, Alexey Khakalo, Ulla Holopainen‐Mantila, Wenyang Xu, Jaana Vapaavuori, Orlando J. Rojas, Bruno D. Mattos   +7 more
wiley   +1 more source

Synchrotron-driven Instabilities in Relativistic Plasmas of Arbitrary Opacity

The Astrophysical Journal
Recent work has shown that synchrotron emission from relativistic plasmas leads the electron distribution to form an anisotropic ring in momentum space, which can be unstable to both kinetic and hydrodynamic instabilities.
Ian E. Ochs
doaj   +1 more source