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Old Puzzle, New Insights: A Lithium-rich Giant Quietly Burning Helium in Its Core

Aguirre, V. Silva; Ruchti, Gregory LU ; Hekker, S.; Cassisi, S.; Christensen-Dalsgaard, J.; Datta, A.; Jendreieck, A.; Jessen-Hansen, J.; Mazumdar, A. and Mosser, B., et al. (2014) In Astrophysical Journal Letters 784(1).
Abstract
About 1% of giant stars have been shown to have large surface Li abundances, which is unexpected according to standard stellar evolution models. Several scenarios for lithium production have been proposed, but it is still unclear why these Li-rich giants exist. A missing piece in this puzzle is the knowledge of the exact stage of evolution of these stars. Using low-and-high-resolution spectroscopic observations, we have undertaken a survey of lithium-rich giants in the Kepler field. In this Letter, we report the finding of the first confirmed Li-rich core-helium-burning giant, as revealed by asteroseismic analysis. The evolutionary timescales constrained by its mass suggest that Li production most likely took place through non-canonical... (More)
About 1% of giant stars have been shown to have large surface Li abundances, which is unexpected according to standard stellar evolution models. Several scenarios for lithium production have been proposed, but it is still unclear why these Li-rich giants exist. A missing piece in this puzzle is the knowledge of the exact stage of evolution of these stars. Using low-and-high-resolution spectroscopic observations, we have undertaken a survey of lithium-rich giants in the Kepler field. In this Letter, we report the finding of the first confirmed Li-rich core-helium-burning giant, as revealed by asteroseismic analysis. The evolutionary timescales constrained by its mass suggest that Li production most likely took place through non-canonical mixing at the RGB tip, possibly during the helium flash. (Less)
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keywords
asteroseismology, stars: abundances, stars: individual (KIC 5000307), stars: late-type, stars: oscillations
in
Astrophysical Journal Letters
volume
784
issue
1
publisher
University of Chicago Press
external identifiers
  • wos:000332786300016
  • scopus:84896789109
ISSN
2041-8213
DOI
10.1088/2041-8205/784/1/L16
language
English
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yes
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80bb2b2c-98d6-4b83-acaf-04f7de8e9223 (old id 4407679)
date added to LUP
2014-04-29 09:26:55
date last changed
2017-01-01 03:47:20
@article{80bb2b2c-98d6-4b83-acaf-04f7de8e9223,
  abstract     = {About 1% of giant stars have been shown to have large surface Li abundances, which is unexpected according to standard stellar evolution models. Several scenarios for lithium production have been proposed, but it is still unclear why these Li-rich giants exist. A missing piece in this puzzle is the knowledge of the exact stage of evolution of these stars. Using low-and-high-resolution spectroscopic observations, we have undertaken a survey of lithium-rich giants in the Kepler field. In this Letter, we report the finding of the first confirmed Li-rich core-helium-burning giant, as revealed by asteroseismic analysis. The evolutionary timescales constrained by its mass suggest that Li production most likely took place through non-canonical mixing at the RGB tip, possibly during the helium flash.},
  articleno    = {L16},
  author       = {Aguirre, V. Silva and Ruchti, Gregory and Hekker, S. and Cassisi, S. and Christensen-Dalsgaard, J. and Datta, A. and Jendreieck, A. and Jessen-Hansen, J. and Mazumdar, A. and Mosser, B. and Stello, D. and Beck, P. G. and de Ridder, J.},
  issn         = {2041-8213},
  keyword      = {asteroseismology,stars: abundances,stars: individual (KIC 5000307),stars: late-type,stars: oscillations},
  language     = {eng},
  number       = {1},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal Letters},
  title        = {Old Puzzle, New Insights: A Lithium-rich Giant Quietly Burning Helium in Its Core},
  url          = {http://dx.doi.org/10.1088/2041-8205/784/1/L16},
  volume       = {784},
  year         = {2014},
}