Tag Archives: LTE

Strontium: To LTE or non-LTE that is the question

C. J. Hansen (1), M. Bergemann (2), G. Cescutti (3), P. Francois (4), A. Arcones (5), A. I. Karakas (6), K. Lind (2), and C. Chiappini (3) ((1) Landessternwarte, ZAH, K ̈ nigstuhl 12, 69117 Heidelberg, Germany; (2) Max-Planck Institute … Continue reading

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NLTE line formation of Fe for late-type stars. I. Standard stars with 1D and model atmospheres

Maria Bergemann (1), K. Lind (1), R. Collet (2,3,1), Z. Magic (1) and M. Asplund (4,1) ((1)Max Planck Institute for Astrophysics, Karl-Schwarzschild Str. 1, 85741, Garching, Germany; (2) Natural History Museum of Denmark, Centre for Star and Planet Formation, Øster … Continue reading

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NLTE analysis of Sr lines

Bergemann, M. (1), Hansen, C. J. (2) Bautista, M. (3) and Ruchti, G. (4) ((1) Max-Planck Institute for Astrophysics, Karl-Schwarzschild Str. 1, 85741, Garching, Germany; (2) Landessternwarte, Königstuhl 12, 69117, Heidelberg, Germany; (3) Department of Physics, Western Michigan University, Kalamazoo, … Continue reading

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NLTE determination of the calcium abundance and 3D corrections in extremely metal-poor stars

M. Spite (1), S.M. Andrievsky (1,2), F. Spite1, E. Caffau (3,1), S.A. Korotin (2), P. Bonifacio (1), H.-G. Ludwig (3), P. François (1), and R. Cayrel (1) ((1) GEPI Observatoire de Paris, CNRS, Universite Paris Diderot,Meudon Cedex, France; (2) Department … Continue reading

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Non-LTE effects on the lead and thorium abundance determinations for cool stars

L. Mashonkina (1, 2),  A. Ryabtsev (3) and A. Frebel (4,5) ((1) Universitäts-Sternwarte München, Scheinerstr, München, Germany; (2) Russian Academy of Sciences, RU, Moscow, Russia; (3) Russian Academy of Sciences, 142190, Troitsk, Moscow region, Russia; (4) Kavli Institute for Astrophysics … Continue reading

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On the sodium overabundance of giants in open clusters: The case of the Hyades

Rodolfo Smiljanic (European Southern Observatory,  Garching bei München, Germany) Sodium abundances have been determined in a large number of giants of open clusters but conflicting results, ranging from solar values to overabundances of up to five orders of magnitude, have … Continue reading

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Modeling the near-UV band of GK stars, Paper II: NLTE models

C. Ian Short (1) Eamonn A. Campbell (1) Heather Pickup (2) Peter H. Hauschildt (3) ((1)Department of Astronomy & Physics and Institute for Computational Astrophysics, Saint Mary’s University, Halifax, Canada; (2) Department of Physics & Astronomy, University of Waterloo, Waterloo,  Canada; (3) … Continue reading

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Role of input atomic data in spectroscopic analyses of the Sun and metal-poor stars

Maria Bergemann (Max-Planck Institute for Astrophysics) Analysis of high-resolution stellar spectra relies heavily upon atomic data. These include energy levels, wavelengths, cross-sections for various types of interactions between particles and photons, such as photoionization and collision induced transitions. Quantum-mechanical calculations … Continue reading

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