Results 11 to 20 of about 215,434 (305)
Radiative Transfer in Stellar Atmospheres [PDF]
EAS Publications Series, 2010 This review presents basic equations for the solution of the NLTE radiative transfer problem for trace elements and methods for its solution are summarized. The importance of frequency coupling in radiative transfer in stellar atmospheres is emphasized.
J. Kubát
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Open Astronomy, 2011 The chemi-ionization processes in atom - Rydberg atom collisions, as well as the corresponding chemi-recombination processes, are considered as factors of influence on the atom exited-state populations in weakly ionized layers of stellar atmospheres. The
Mihajlov Anatolij A. +3 more
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Stellar fluxes as probes of convection in stellar atmospheres [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractConvection and turbulence in stellar atmospheres have a significant effect on the emergent flux from late-type stars. The theoretical advancements in convection modelling over recent years have proved challenging for the observers to obtain measurements with sufficient precision and accuracy to allow discrimination between the various ...
Smalley, B
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Improving 1D Stellar Models with 3D Atmospheres [PDF]
EPJ Web of Conferences, 2017 Stellar evolution codes play a major role in present-day astrophysics, yet they share common issues. In this work we seek to remedy some of those by the use of results from realistic and highly detailed 3D hydrodynamical simulations of stellar ...
Mosumgaard Jakob Rørsted +4 more
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A New High-Precision Correction Method of Temperature Distribution in Model Stellar Atmospheres
Open Astronomy, 2013 The main features of the temperature correction methods, suggested and used in modeling of plane-parallel stellar atmospheres, are discussed. The main features of the new method are described.
Sapar A., Poolamäe R., Sapar L.
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Atmospheres of brown dwarfs [PDF]
, 2014 ChH highlights financial support of the European Community under the FP7 by an ERC starting grant. SLC acknowledges financial support of University of LeicesterBrown Dwarfs are the coolest class of stellar objects known to date. Our present perception is
Casewell, Sarah, Helling, Christiane
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Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium
The Astrophysical Journal, 2023 The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard +1 more
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New Methods in Modeling of Hot Stellar Atmospheres
Open Astronomy, 2013 In the present study we had three main aims. First to study the possibility of reducing the initial model atmosphere data to short analytical polynomials.
Sapar A., Poolamäe R., Sapar L.
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Study of atmospheres in the solar system, from stellar occultation or planetary transit
Comptes Rendus. Physique, 2022 Stellar occultations and transits occur when a planetary body passes in front of a star (including our Sun). For objects with an atmosphere, refraction plays an essential role to explain the drops of flux and the aureoles observed during these events ...
Sicardy, Bruno
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Dimension in a Radiative Stellar Atmosphere [PDF]
General Relativity and Gravitation, 2001 Dimensional scales are examined in an extended 3+1 Vaidya atmosphere surrounding a Schwarzschild source. At one scale, the Vaidya null fluid vanishes and the spacetime contains only a single spherical 2-surface. Both of these behaviors can be addressed by including higher dimensions in the spacetime metric.
Krisch, J. P., Glass, E. N.
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