Results 1 to 10 of about 6,180 (146)
Solar and stellar photospheric abundances
Living Reviews in Solar Physics, 2016 The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations.
Carlos Allende Prieto
doaj +3 more sources
PEPSI Investigation, Retrieval, and Atlas of Numerous Giant Atmospheres (PIRANGA). IV. High-resolution Phased-resolved Spectroscopy of the Ultra-hot-Jupiter KELT-20 b [PDF]
The Astronomical JournalWe present five datasets of high-resolution optical emission spectra of the ultra-hot-Jupiter KELT-20 b with the PEPSI spectrograph. Using a Bayesian retrieval framework, we constrain its dayside pressure–temperature profile and abundances of Fe, Ni, and
Victoria Bonidie +9 more
doaj +2 more sources
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT Motivated by the controversy over the surface metallicity of the Sun, we present a re-analysis of the solar photospheric oxygen (O) abundance. New atomic models of O and Ni are used to perform non-local thermodynamic equilibrium (NLTE) calculations with 1D hydrostatic (MARCS) and 3D hydrodynamical (Stagger and Bifrost) models ...
Maria Bergemann +12 more
openaire +6 more sources
Solar data uncertainty impacts on MCMC methods for r-process nucleosynthesis
Frontiers in Physics, 2022 In recent work, we developed a Markov Chain Monte Carlo (MCMC) procedure to predict the ground state masses capable of forming the observed Solar r-process rare-earth abundance peak.
Nicole Vassh +4 more
doaj +1 more source
Element Abundances in Impulsive Solar Energetic-Particle Events
Universe, 2023 Impulsive solar energetic-particle (SEP) events were first distinguished as the streaming electrons that produce type III radio bursts as distinct from shock-induced type II bursts. They were then observed as the surprisingly enhanced 3He-rich SEP events,
Donald V. Reames
doaj +2 more sources
Measuring Solar Abundances [PDF]
AIP Conference Proceedings, 2001 This is the rapporteur paper of Working Group 2 on Measuring Solar Abundances. The working group presented and discussed the different observations and methods for obtaining the elemental and isotopic composition of the Sun, and critically reviewed their results and the accuracies thereof.
von Steiger, R. +17 more
openaire +3 more sources
Helioseismology and solar abundances [PDF]
Physics Reports, 2008 To appear in Physics Reports.
Basu, Sarbani, Antia, H. M.
openaire +2 more sources
The Astrophysical Journal, 2023 The plasma composition of the solar corona is different from that of the solar photosphere. Elements that have a low first ionization potential (FIP) are preferentially transported to the corona and therefore show enhanced abundances in the corona ...
Teodora Mihailescu +8 more
doaj +1 more source
Solar abundance of platinum [PDF]
Proceedings of the National Academy of Sciences, 1975 Three lines of neutral platinum, located at λ 2997.98 Å, λ 3064.71 Å, and λ 3301.86 Å have been used to determine the solar platinum abundance by the method of spectral synthesis. On the scale, log A (H) = 12.00, the thus-derived solar platinum abundance is 1.75 ± 0.10, in fair accord with Cameron's value of log
H, Burger, L H, Aller
openaire +2 more sources
Understanding the Relationship between Solar Coronal Abundances and F10.7 cm Radio Emission
The Astrophysical Journal, 2023 Sun-as-a-star coronal plasma composition, derived from full-Sun spectra, and the F10.7 radio flux (2.8 GHz) have been shown to be highly correlated ( r = 0.88) during solar cycle 24.
Andy S. H. To +9 more
doaj +1 more source