Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8574
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dc.contributor.authorSampoorna, M-
dc.contributor.authorPaletou, F-
dc.contributor.authorBommier, V-
dc.contributor.authorLagache, T-
dc.date.accessioned2024-11-12T05:55:27Z-
dc.date.available2024-11-12T05:55:27Z-
dc.date.issued2024-10-
dc.identifier.citationAstronomy & Astrophysics, Vol. 690, A213en_US
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/2248/8574-
dc.descriptionOpen Accessen_US
dc.descriptionOpen Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited-
dc.description.abstractIn the present paper we consider the full nonlocal thermodynamic equilibrium (non-LTE) radiation transfer problem. This formalism allows us to account for deviation from equilibrium distribution of both the radiation field and the massive particles. In the present study, two-level atoms with broadened upper level represent the massive particles. In the absence of velocity-changing collisions, we demonstrate the analytic equivalence of the full non-LTE source function with the corresponding standard non-LTE partial frequency redistribution (PFR) model. We present an iterative method based on operator splitting techniques that can be used to numerically solve the problem at hand. We benchmark it against the standard non-LTE transfer problem for a two-level atom with PFR. We illustrate the deviation of the velocity distribution function of excited atoms from the equilibrium distribution. We also discuss the dependence of the emission profile and the velocity distribution function on elastic collisions and velocity-changing collisions.en_US
dc.language.isoenen_US
dc.publisherEDP Sciencesen_US
dc.relation.urihttps://doi.org/10.1051/0004-6361/202449722-
dc.rights© The Authors 2024-
dc.subjectLine: formationen_US
dc.subjectLine: profilesen_US
dc.subjectRadiation mechanisms: generalen_US
dc.subjectRadiative transferen_US
dc.subjectMethods: numericalen_US
dc.subjectStars: atmospheresen_US
dc.titleFull non-LTE spectral line formation III. The case of a two-level atom with broadened upper levelen_US
dc.typeArticleen_US
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