FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3103984186> ?p ?o ?g. }

• W3103984186 endingPage "A96" @default.
• W3103984186 startingPage "A96" @default.
• W3103984186 abstract "Un-evolved, very metal-poor stars are the most important tracers of the cosmic abundance of lithium in the early universe. Combining the standard Big Bang nucleosynthesis model with Galactic production through cosmic ray spallation, these stars at [Fe/H]<-2 are expected to show an undetectably small 6Li/7Li isotopic signature. Evidence to the contrary may necessitate an additional pre-galactic production source or a revision of the standard model of Big Bang nucleosynthesis. We revisit the isotopic analysis of four halo stars, two with claimed 6Li-detections in the literature, to investigate the influence of improved model atmospheres and line formation treatment. For the first time, a combined 3D, NLTE (non-local thermodynamic equilibrium) modelling technique for Li, Na, and Ca lines is utilised to constrain the intrinsic line-broadening and to determine the Li isotopic ratio. We discuss the influence of 3D NLTE effects on line profile shapes and assess the realism of our modelling using the Ca excitation and ionisation balance. By accounting for NLTE line formation in realistic 3D hydrodynamical model atmospheres, we can model the Li resonance line and other neutral lines with a consistency that is superior to LTE, with no need for additional line asymmetry caused by the presence of 6Li. Contrary to the results from 1D and 3D LTE modelling, no star in our sample has a significant 2-sigma detection of the lighter isotope in NLTE. Over a large parameter space, NLTE modelling systematically reduces the best-fit Li isotopic ratios by up to five percentage points. As a bi-product, we also present the first ever 3D NLTE Ca and Na abundances of halo stars, which reveal significant departures from LTE. The observational support for a significant and non-standard 6Li production source in the early universe is substantially weakened by our findings." @default.
• W3103984186 created "2020-11-23" @default.
• W3103984186 creator A5013185774 @default.
• W3103984186 creator A5024091569 @default.
• W3103984186 creator A5054681294 @default.
• W3103984186 creator A5063887198 @default.
• W3103984186 creator A5084983787 @default.
• W3103984186 date "2013-06-01" @default.
• W3103984186 modified "2023-10-14" @default.
• W3103984186 title "The lithium isotopic ratio in very metal-poor stars" @default.
• W3103984186 cites W1964606185 @default.
• W3103984186 cites W1970955150 @default.
• W3103984186 cites W1973694448 @default.
• W3103984186 cites W1974435520 @default.
• W3103984186 cites W1991273494 @default.
• W3103984186 cites W2007329177 @default.
• W3103984186 cites W2019671710 @default.
• W3103984186 cites W2050114787 @default.
• W3103984186 cites W2058575327 @default.
• W3103984186 cites W2060660695 @default.
• W3103984186 cites W2096433368 @default.
• W3103984186 cites W2103252643 @default.
• W3103984186 cites W2116621046 @default.
• W3103984186 cites W2116889572 @default.
• W3103984186 cites W2121650431 @default.
• W3103984186 cites W2121872350 @default.
• W3103984186 cites W2127304902 @default.
• W3103984186 cites W2130618063 @default.
• W3103984186 cites W2132358681 @default.
• W3103984186 cites W2147875900 @default.
• W3103984186 cites W2151554466 @default.
• W3103984186 cites W2152123318 @default.
• W3103984186 cites W2155291506 @default.
• W3103984186 cites W2166338216 @default.
• W3103984186 cites W2168745957 @default.
• W3103984186 cites W3098968922 @default.
• W3103984186 cites W3099225606 @default.
• W3103984186 cites W3100361043 @default.
• W3103984186 cites W3100620342 @default.
• W3103984186 cites W3104427216 @default.
• W3103984186 cites W3105675745 @default.
• W3103984186 cites W3106147070 @default.
• W3103984186 cites W3106194574 @default.
• W3103984186 cites W3125096806 @default.
• W3103984186 cites W4237663383 @default.
• W3103984186 cites W4300919906 @default.
• W3103984186 cites W501998787 @default.
• W3103984186 doi "https://doi.org/10.1051/0004-6361/201321406" @default.
• W3103984186 hasPublicationYear "2013" @default.
• W3103984186 type Work @default.
• W3103984186 sameAs 3103984186 @default.
• W3103984186 citedByCount "113" @default.
• W3103984186 countsByYear W31039841862013 @default.
• W3103984186 countsByYear W31039841862014 @default.
• W3103984186 countsByYear W31039841862015 @default.
• W3103984186 countsByYear W31039841862016 @default.
• W3103984186 countsByYear W31039841862017 @default.
• W3103984186 countsByYear W31039841862018 @default.
• W3103984186 countsByYear W31039841862019 @default.
• W3103984186 countsByYear W31039841862020 @default.
• W3103984186 countsByYear W31039841862021 @default.
• W3103984186 countsByYear W31039841862022 @default.
• W3103984186 countsByYear W31039841862023 @default.
• W3103984186 crossrefType "journal-article" @default.
• W3103984186 hasAuthorship W3103984186A5013185774 @default.
• W3103984186 hasAuthorship W3103984186A5024091569 @default.
• W3103984186 hasAuthorship W3103984186A5054681294 @default.
• W3103984186 hasAuthorship W3103984186A5063887198 @default.
• W3103984186 hasAuthorship W3103984186A5084983787 @default.
• W3103984186 hasBestOaLocation W31039841861 @default.
• W3103984186 hasConcept C121332964 @default.
• W3103984186 hasConcept C1276947 @default.
• W3103984186 hasConcept C150846664 @default.
• W3103984186 hasConcept C16743098 @default.
• W3103984186 hasConcept C184665706 @default.
• W3103984186 hasConcept C198352243 @default.
• W3103984186 hasConcept C2524010 @default.
• W3103984186 hasConcept C33923547 @default.
• W3103984186 hasConcept C4397270 @default.
• W3103984186 hasConcept C44870925 @default.
• W3103984186 hasConcept C48387981 @default.
• W3103984186 hasConcept C98444146 @default.
• W3103984186 hasConceptScore W3103984186C121332964 @default.
• W3103984186 hasConceptScore W3103984186C1276947 @default.
• W3103984186 hasConceptScore W3103984186C150846664 @default.
• W3103984186 hasConceptScore W3103984186C16743098 @default.
• W3103984186 hasConceptScore W3103984186C184665706 @default.
• W3103984186 hasConceptScore W3103984186C198352243 @default.
• W3103984186 hasConceptScore W3103984186C2524010 @default.
• W3103984186 hasConceptScore W3103984186C33923547 @default.
• W3103984186 hasConceptScore W3103984186C4397270 @default.
• W3103984186 hasConceptScore W3103984186C44870925 @default.
• W3103984186 hasConceptScore W3103984186C48387981 @default.
• W3103984186 hasConceptScore W3103984186C98444146 @default.
• W3103984186 hasLocation W31039841861 @default.
• W3103984186 hasLocation W31039841862 @default.
• W3103984186 hasLocation W31039841863 @default.
• W3103984186 hasLocation W31039841864 @default.

• next