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• W3100059605 endingPage "40" @default.
• W3100059605 startingPage "40" @default.
• W3100059605 abstract "We report the discovery of J1521-3538, a bright (V=12.2), very metal-poor ([Fe/H]=-2.8) strongly r-process enhanced field horizontal branch star, based on a high-resolution, high signal-to-noise Magellan/MIKE spectrum. J1521-3538 shows the largest r-process element over-abundance in any known r-process-enhanced star, with [Eu/Fe]=+2.2, and its chemical abundances of 22 neutron-capture elements closely match the scaled solar r-process pattern. J1521-3538 is also one of few known carbon-enhanced metal-poor stars with r-process enhancement (CEMP-r stars), as found after correcting the measured C abundance for the star's evolutionary status. We propose to extend the existing classification of moderately enhanced (+0.3<=[Eu/Fe]<=+1.0) r-I and strongly r-process enhanced ([Eu/Fe]>+1.0) r-II stars to include an r-III class, for r-process stars such as J1521-3538, with [Eu/Fe]>+2.0 and [Ba/Eu]<-0.5, or >100 times the solar ratio of europium to iron. Using cosmochronometry, we estimate J1521-3538 to be 12.5+-5 Gyr and 8.9+-5 Gyr old, using two different sets of initial production ratios. These ages are based on measurements of the Th line at 4019 A and other r-process element abundances. This is broadly consistent with the old age of a low-mass metal-poor field red horizontal branch star. J1521-3538 likely originated in a low-mass dwarf galaxy that was later accreted by the Milky Way, as evidenced by its highly eccentric orbit." @default.
• W3100059605 created "2020-11-23" @default.
• W3100059605 creator A5001805245 @default.
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• W3100059605 creator A5027422363 @default.
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• W3100059605 creator A5049021876 @default.
• W3100059605 creator A5053644519 @default.
• W3100059605 creator A5054532941 @default.
• W3100059605 creator A5054681294 @default.
• W3100059605 creator A5054802275 @default.
• W3100059605 date "2020-07-21" @default.
• W3100059605 modified "2023-10-03" @default.
• W3100059605 title "The <i>R</i>-Process Alliance: A Very Metal-poor, Extremely <i>r</i>-process-enhanced Star with [Eu/Fe] = + 2.2, and the Class of <i>r-</i>III Stars" @default.
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