Matches in SemOpenAlex for { <https://semopenalex.org/work/W2149675082> ?p ?o ?g. }
Showing items 1 to 80 of
80
with 100 items per page.
- W2149675082 endingPage "456" @default.
- W2149675082 startingPage "449" @default.
- W2149675082 abstract "Abstract We present HE 1523-0901, a metal-poor star in which the radioactive elements Th and U could be detected. Only three stars have measured U abundances, of which HE 1523-0901 has the most confidently determined value. From comparing the stable Eu, Os, and Ir abundances with measurements of Th and U, stellar ages can be derived. Based on seven such chronometer abundance ratios, the age of HE 1523-0901 was found to be ~13 Gyr. Only an upper limit for Pb could be measured so far. Knowing all three abundances of Th, U, and Pb would provide a self-consistent test for r-process calculations. Pb is the beta- plus alpha-decay end-product of all decay chains in the mass region between Pb and the onset of dominant spontaneous fission above Th and U. Hence, in addition to Th/U also Th, U/Pb should be used to obtain a consistent picture for actinide chronometry. From recent r-process calculations within the classical “waiting-point” model, for a 13 Gyr old star we predict the respective abundance ratios of logϵ(Th/U) = 0.84, logϵ(Th/Pb) = −1.32 and logϵ(U/Pb) = −2.16. We compare these values with the measured abundance ratios in HE 1523-0901 of logϵ(Th/U) = 0.86, logϵ(Th/Pb) > −1.0 and logϵ(U/Pb) > −1.9. With this good level of agreement, HE 1523-0901 is already a vital probe for observational “near-field” cosmology by providing an independent lower limit for the age of the Universe." @default.
- W2149675082 created "2016-06-24" @default.
- W2149675082 creator A5043807979 @default.
- W2149675082 creator A5049021876 @default.
- W2149675082 date "2008-10-01" @default.
- W2149675082 modified "2023-10-12" @default.
- W2149675082 title "Stellar age dating with thorium, uranium and lead" @default.
- W2149675082 cites W1708332080 @default.
- W2149675082 cites W1971880454 @default.
- W2149675082 cites W1984462745 @default.
- W2149675082 cites W1985433643 @default.
- W2149675082 cites W1989629557 @default.
- W2149675082 cites W1994294595 @default.
- W2149675082 cites W2012108819 @default.
- W2149675082 cites W2016846163 @default.
- W2149675082 cites W2040653746 @default.
- W2149675082 cites W2076140243 @default.
- W2149675082 cites W2079349557 @default.
- W2149675082 cites W2103165993 @default.
- W2149675082 cites W2104311895 @default.
- W2149675082 cites W2130863465 @default.
- W2149675082 cites W2148936717 @default.
- W2149675082 cites W2154748230 @default.
- W2149675082 cites W2167390523 @default.
- W2149675082 cites W3100799550 @default.
- W2149675082 cites W3103980363 @default.
- W2149675082 cites W3104310782 @default.
- W2149675082 doi "https://doi.org/10.1017/s1743921309032104" @default.
- W2149675082 hasPublicationYear "2008" @default.
- W2149675082 type Work @default.
- W2149675082 sameAs 2149675082 @default.
- W2149675082 citedByCount "4" @default.
- W2149675082 countsByYear W21496750822020 @default.
- W2149675082 countsByYear W21496750822021 @default.
- W2149675082 countsByYear W21496750822023 @default.
- W2149675082 crossrefType "journal-article" @default.
- W2149675082 hasAuthorship W2149675082A5043807979 @default.
- W2149675082 hasAuthorship W2149675082A5049021876 @default.
- W2149675082 hasBestOaLocation W21496750821 @default.
- W2149675082 hasConcept C121332964 @default.
- W2149675082 hasConcept C150846664 @default.
- W2149675082 hasConcept C185544564 @default.
- W2149675082 hasConcept C4397270 @default.
- W2149675082 hasConcept C44870925 @default.
- W2149675082 hasConcept C505870484 @default.
- W2149675082 hasConcept C527038400 @default.
- W2149675082 hasConcept C555451288 @default.
- W2149675082 hasConcept C77077793 @default.
- W2149675082 hasConcept C86803240 @default.
- W2149675082 hasConceptScore W2149675082C121332964 @default.
- W2149675082 hasConceptScore W2149675082C150846664 @default.
- W2149675082 hasConceptScore W2149675082C185544564 @default.
- W2149675082 hasConceptScore W2149675082C4397270 @default.
- W2149675082 hasConceptScore W2149675082C44870925 @default.
- W2149675082 hasConceptScore W2149675082C505870484 @default.
- W2149675082 hasConceptScore W2149675082C527038400 @default.
- W2149675082 hasConceptScore W2149675082C555451288 @default.
- W2149675082 hasConceptScore W2149675082C77077793 @default.
- W2149675082 hasConceptScore W2149675082C86803240 @default.
- W2149675082 hasIssue "S258" @default.
- W2149675082 hasLocation W21496750821 @default.
- W2149675082 hasOpenAccess W2149675082 @default.
- W2149675082 hasPrimaryLocation W21496750821 @default.
- W2149675082 hasRelatedWork W1986109513 @default.
- W2149675082 hasRelatedWork W2078374943 @default.
- W2149675082 hasRelatedWork W2144336191 @default.
- W2149675082 hasRelatedWork W2263849334 @default.
- W2149675082 hasRelatedWork W2328062370 @default.
- W2149675082 hasRelatedWork W2374033633 @default.
- W2149675082 hasRelatedWork W2969763541 @default.
- W2149675082 hasRelatedWork W4253218794 @default.
- W2149675082 hasRelatedWork W4294933874 @default.
- W2149675082 hasRelatedWork W2158876013 @default.
- W2149675082 hasVolume "4" @default.
- W2149675082 isParatext "false" @default.
- W2149675082 isRetracted "false" @default.
- W2149675082 magId "2149675082" @default.
- W2149675082 workType "article" @default.