Results 11 to 20 of about 6,299 (262)
Solar abundance of osmium [PDF]
Proceedings of the National Academy of Sciences, 1976 The abundance parameter, log gfA , where g is the statistical weight of the lower level, f is the oscillator strength, and A is the abundance (by numbers of atoms with respect to hydrogen), has been derived for three lines of osmium by a method ...
G, Jacoby, L H, Aller
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Solar Abundance of Gallium [PDF]
Proceedings of the National Academy of Sciences, 1970 The spectral region around the λ4172 Å resonance line of gallium has been synthesized at disk positions μ = 1.0, 0.5, and 0.3. The center-limb variation can be reproduced by Elste's semiempirical model if a macroturbulent smearing of the emergent spectrum due to mass motions with mean velocity decreasing with altitude are introduced.
J, Ross, L, Aller
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Solar abundance of iridium [PDF]
Proceedings of the National Academy of Sciences, 1976 By a method of spectrum synthesis, which yields log gfA , where g is the statistical weight of the lower level, f is the oscillator strength, and A is the abundance, an attempt is made to deduce the solar iridium abundance from one relatively ...
S, Drake, L H, Aller
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The Astrophysical Journal Letters, 2023 We employ the differential evolution (DE) method to analyze observations from the Solar X-Ray Monitor on board the Chandrayaan-2 spacecraft. DE belongs to the family of evolutionary algorithms that find solutions using mechanisms inspired by biological ...
Anna Kępa +4 more
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, 2014 16 pages, accepted for publication as a chapter in "Determination of Atmospheric Parameters of B, A, F and G Type Stars", Springer (2014), eds. E. Niemczura, B.
Bergemann, Maria, Serenelli, Aldo
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Chemical Composition of RR Lyn – an Eclipsing Binary System with Am and λ Boo Type Components [PDF]
Journal of Astronomy and Space Sciences, 2017 High-resolution spectroscopic observations of the eclipsing binary system RR Lyn were made using the 1.8 m telescope at the Bohuynsan Optical Astronomical Observatory in Korea.
Yeuncheol Jeong +4 more
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Extended MCDHF Calculations of Energy Levels and Transition Data for N i
The Astrophysical Journal Supplement Series, 2023 Accurate and extensive atomic data are essential for spectroscopic analyses of stellar atmospheres and other astronomical objects. We present energy levels, lifetimes, and transition probabilities for neutral nitrogen, the sixth most abundant element in ...
M. C. Li +4 more
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Solar scandium abundance [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractWe investigate the formation of neutral and singly ionized scandium lines in the solar photospheres. Extensive statistical equilibrium calculations were carried out for a model atom, which comprises 92 terms for Sc I and 79 for Sc II. Synthetic line profiles calculated from the level populations according to the NLTE departure coefficients were
H. W. Zhang, T. Gehren, G. Zhao
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SOLAR MODELS WITH REVISED ABUNDANCE [PDF]
The Astrophysical Journal, 2011 We present new solar models in which we use the latest low abundances and we further include the effects of rotation, magnetic fields and extra-mixing processes. We assume that the extra-element mixing can be treated as a diffusion process, with the diffusion coefficient depending mainly on the solar internal configuration of rotation and magnetic ...
Bi, Shaolan +3 more
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Comparison of the Composition of ICMEs from Active Regions and Quiet-Sun Regions
The Astrophysical Journal, 2023 The composition of interplanetary coronal mass ejections (ICMEs), including the ionic charge states and elemental abundances of heavy elements, is tightly correlated with their source regions and eruption processes.
Jinrong Li +6 more
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