research data . Dataset . 2019

Catalog of 2,330 lithium-rich giant stars

Casey, Andrew R.;
Open Access
  • Published: 22 Oct 2019
  • Publisher: Zenodo
Abstract
Theoretical models of stellar evolution predict that most of the lithium inside a star is destroyed as the star becomes a red giant. However, observations reveal that about 1% of red giants are peculiarly rich in lithium, often exceeding the amount in the interstellar medium or predicted from the Big Bang. With only about 150 lithium-rich giants discovered in the past four decades, and no distinguishing properties other than lithium enhancement, the origin of lithium-rich giant stars is one of the oldest problems in stellar astrophysics. Here we report the discovery of 2,330 low-mass (1 to 3$\,M_\odot$) lithium-rich giant stars, which we argue are consistent with internal lithium production that is driven by tidal spin-up by a binary companion. Our sample reveals that most lithium-rich giants have helium-burning cores ($80^{+7}_{-6}\%$), and that the frequency of lithium-rich giants rises with increasing stellar metallicity. We find that while planet accretion may explain some lithium-rich giants, it cannot account for the majority that have helium-burning cores. We rule out most other proposed explanations as the primary mechanism for lithium-rich giants, including all stages related to single star evolution. Our analysis shows that giants remain lithium-rich for only about two million years. A prediction from this lithium depletion timescale is that most lithium-rich giants with a helium-burning core have a binary companion.
Subjects
arXiv: Astrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy Astrophysics Physics::Atomic Physics Astrophysics::Cosmology and Extragalactic Astrophysics
Funded by
NSF| Graduate Research Fellowship Program (GRFP)
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1144469
  • Funding stream: Directorate for Education & Human Resources | Division of Graduate Education
,
ARC| Discovery Projects - Grant ID: DP160100637
Project
  • Funder: Australian Research Council (ARC) (ARC)
  • Project Code: DP160100637
  • Funding stream: Discovery Projects
,
EC| STELLARAGES
Project
STELLARAGES
Accurate ages of stars
  • Funder: European Commission (EC)
  • Project Code: 338251
  • Funding stream: FP7 | SP2 | ERC
,
EC| MW-DISK
Project
MW-DISK
How the Milky Way Built Its Disk
  • Funder: European Commission (EC)
  • Project Code: 321035
  • Funding stream: FP7 | SP2 | ERC
,
NSF| PIRE: GROWTH: Global Relay of Observatories Watching Transients Happen
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1545949
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Open Access
ZENODO
Dataset . 2019
Providers: ZENODO
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