WIYN open cluster study: The old open cluster, NGC 188, and a re-evaluation of Lithium-richness among red giants

@article{Sun2022WIYNOC,
  title={WIYN open cluster study: The old open cluster, NGC 188, and a re-evaluation of Lithium-richness among red giants},
  author={Qinghui Sun and Constantine P. Deliyannis and Bruce A. Twarog and Barbara J. Anthony-Twarog and Jeffrey D. Cummings and Aaron Steinhauer},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2022}
}
We present WIYN★/Hydra spectra of 34 red giant candidate members of NGC 188, which, together with WOCS† and Gaia data yield 23 single members, 6 binary members, 4 single nonmembers, and 1 binary nonmember. We report [Fe/H] for 29 members and derive [Fe/H]NGC188 = +0.064 ± 0.018 dex (σμ) (sky spectra yield A(Fe)⊙ = 7.520 ± 0.015 dex (σμ)). We discuss effects on the derived parameters of varying Yale-Yonsei isochrones to fit the turnoff. We take advantage of the coolest, lowest-gravity giants… 

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