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Peer-reviewedCC BY 4.0Monthly Notices of the Royal Astronomical Society

Temperature-dependent differences between empirical lithium age estimators in benchmark open clusters

  • Ramarao Tata1
  • Eduardo L Martín2
  • Eder Martioli3
  • Diego Lorenzo-Oliveira3
  • Junyan Zhang4
4 affiliations
  1. 1Ohio University Department of Physics and Astronomy, , Athens, OH 45701 ,
  2. 2Instituto de Astrofísica de Canarias , C/ Vía Láctea s/n, E-38205 La Laguna, Tenerife ,
  3. 3Laboratório Nacional de Astrofísica/MCTI , Rua Estados Unidos 154, 37504-364 Itajubá, MG ,
  4. 4University of Western Ontario Department of Physics and Astronomy, , London, ON N6A 3K7 ,
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Abstract

The two public versions of the EAGLES empirical lithium age estimator, analytic (v1) and neural-network (v2.0), are applied to identical published lithium equivalent widths for Blanco 1, the Pleiades and NGC 2516. In these samples, they agree within their combined 68 per cent uncertainties above 4900 K and within half those uncertainties in the three tested windows above 4700 K. For the cool subsets (at or below 4300 K) the ages differ by 37 to 136 Myr. In Blanco 1, where 2 of 103 cool members have lithium detections above three sigma, the versions agree on detected stars at every tested temperature boundary; this selection does not establish the cause of the difference. In the Pleiades cool members and the NGC 2516 K dwarfs they differ on detected stars too. Extending the cool sample to warmer stars yields agreement only in the Pleiades. The external ages do not settle which version is right: two clusters belong to both calibrations, the Blanco 1 depletion-boundary ages favour the network, and an asteroseismic age for NGC 2516 favours the analytic model for the original samples. For cool-dominated samples in this 60 to 300 Myr comparison, users should report the estimator spread.

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Cite

BibTeXRIS
BibTeX
@article{tata2026temperaturedependent,
  title = {{Temperature-dependent differences between empirical lithium age estimators in benchmark open clusters}},
  author = {Ramarao Tata and Eduardo L Martín and Eder Martioli and Diego Lorenzo-Oliveira and Junyan Zhang},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = nov,
  doi = {10.1093/mnras/stag2098},
  url = {https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2098/9011254},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Temperature-dependent differences between empirical lithium age estimators in benchmark open clusters
AU  - Ramarao Tata
AU  - Eduardo L Martín
AU  - Eder Martioli
AU  - Diego Lorenzo-Oliveira
AU  - Junyan Zhang
PY  - 2026
DA  - 2026/11/03
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag2098
UR  - https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2098/9011254
AB  - The two public versions of the EAGLES empirical lithium age estimator, analytic (v1) and neural-network (v2.0), are applied to identical published lithium equivalent widths for Blanco 1, the Pleiades and NGC 2516. In these samples, they agree within their combined 68 per cent uncertainties above 4900 K and within half those uncertainties in the three tested windows above 4700 K. For the cool subsets (at or below 4300 K) the ages differ by 37 to 136 Myr. In Blanco 1, where 2 of 103 cool members have lithium detections above three sigma, the versions agree on detected stars at every tested temperature boundary; this selection does not establish the cause of the difference. In the Pleiades cool members and the NGC 2516 K dwarfs they differ on detected stars too. Extending the cool sample to warmer stars yields agreement only in the Pleiades. The external ages do not settle which version is right: two clusters belong to both calibrations, the Blanco 1 depletion-boundary ages favour the network, and an asteroseismic age for NGC 2516 favours the analytic model for the original samples. For cool-dominated samples in this 60 to 300 Myr comparison, users should report the estimator spread.
SN  - 0035-8711
SN  - 1365-2966
ER  -