Results 41 to 50 of about 34,429 (304)

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

Physical Retrieval of Rain Rate from Ground-Based Microwave Radiometry

Remote Sensing, 2021
Because of its clear physical meaning, physical methods are more often used for space-borne microwave radiometers to retrieve the rain rate, but they are rarely used for ground-based microwave radiometers that are very sensitive to rainfall.
Wenyue Wang, Klemens Hocke, Christian Mätzler   +2 more
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

Radiative opacities for carbon- and oxygen-rich mixtures

The Astrophysical Journal, 1993
Recent OPAL calculations have obtained significant differences in the Rosseland mean opacities compared with earlier Los Alamos work. These new opacities have had a favorable impact on several astrophysical problems, but the efforts have concentrated on hydrogen main-sequence stars or stellar envelopes.
Carlos A. Iglesias, F. J. Rogers
openalex   +3 more sources

Important role of stratospheric injection height for the distribution and radiative forcing of smoke aerosol from the 2019–2020 Australian wildfires [PDF]

Atmospheric Chemistry and Physics, 2022
More than 1 Tg smoke aerosol was emitted into the atmosphere by the exceptional 2019–2020 southeastern Australian wildfires. Triggered by the extreme fire heat, several deep pyroconvective events carried the smoke directly into the stratosphere.
B. Heinold, H. Baars, B. Barja, M. Christensen, M. Christensen, A. Kubin, K. Ohneiser, K. Schepanski, K. Schepanski, N. Schutgens, F. Senf, R. Schrödner, D. Villanueva, D. Villanueva, I. Tegen   +14 more
doaj   +1 more source

Instabilities in the Envelopes and Winds of Very Massive Stars

, 2014
The high luminosity of Very Massive Stars (VMS) means that radiative forces play an important, dynamical role both in the structure and stability of their stellar envelope, and in driving strong stellar-wind mass loss.
A. A. Belyanin, A. Feldmeier, A. Feldmeier, A. J. Marle van, A. Pauldrach, A. S. Eddington, A. W. Fullerton, C. A. Iglesias, C. D. Levermore, C. F. Gammie, D. F. Figer, D. H. Cohen, E. A. Spiegel, E. A. Spiegel, E. A. Spiegel, E. T. Vishniac, G. C. Pomraning, J. Arons, J. C. B. Papaloizou, J. I. Castor, J. O. Sundqvist, J. O. Sundqvist, J. Petrovic, K. B. MacGregor, K. G. Gayley, L. B. Lucy, L. B. Lucy, L. Dessart, L. M. Oskinova, M. C. Begelman, M. C. Runacres, M. S. Oey, N. Grevesse, N. J. Shaviv, N. J. Shaviv, N. J. Shaviv, N. Smith, N. Smith, N. Smith, O. Blaes, P. A. Crowther, P. C. Joss, R. Kippenhahn, R. P. Kudritzki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, T. Quinn, V. V. Sobolev, W. Glatzel, W. Glatzel   +53 more
core   +1 more source

Estimation of the radiation budget during MOSAiC based on ground-based and satellite remote sensing observations [PDF]

Atmospheric Chemistry and Physics
An accurate representation of the radiation budget is essential for investigating the impact of clouds on the climate system, especially in the Arctic, an environment highly sensitive to complex and rapid environmental changes.
C. Barrientos-Velasco, C. Barrientos-Velasco, C. J. Cox, H. Deneke, J. B. Dodson, A. Hünerbein, M. D. Shupe, M. D. Shupe, P. C. Taylor, A. Macke   +9 more
doaj   +1 more source

Analytical expressions for radiative opacities of low Z plasmas

Journal of Physics: Conference Series, 2010
In this work we obtain analytical expressions for the radiative opacity of several low Z plasmas (He, Li, Be, and B) in a wide range of temperatures and densities. These formulas are obtained by fitting the proposed expression to mean opacities data calculated by using the code ABAKO/ RAPCAL. This code computes the radiative properties of plasmas, both
Garcia Rubiano, Jesus, Martel, Pablo, Gil, J.M., Rodríguez, Rafael y Gil, Florido, Ricardo, Mendoza, M.A., Mínguez Torres, Emilio   +6 more
openaire   +3 more sources

Important consequences of atomic diffusion inside main-sequence stars: opacities, extra-mixing, oscillations

EPJ Web of Conferences, 2017
Atomic diffusion, including the effects of radiative accelerations on individual elements, leads to important variations of the chemical composition inside stars.
Deal M., Vauclair S., Richard O.
doaj   +1 more source

A numerical model for multigroup radiation hydrodynamics

, 2011
We present in this paper a multigroup model for radiation hydrodynamics to account for variations of the gas opacity as a function of frequency. The entropy closure model (M1) is applied to multigroup radiation transfer in a radiation hydrodynamics code.
B. Dubroca, Berthon, Blinnikov, Buchler, Charrier, Dubroca, Dubroca, E. Audit, F. Delahaye, González, Larsen, Larsen, Larsen, Levermore, Levermore, Lowrie, Mihalas, Mihalas, Minerbo, Müller, N.M.H. Vaytet, Olson, Ramis, Skartlien, Struchtrup, Turpault   +25 more
core   +2 more sources