Titans metal-poor reference stars II. Red giants and CEMP stars
Riano E. Giribaldi, Sophie Van Eck, Thibault Merle, Alain Jorissen,, Pawel Krynski, Lea Planquart, Marica Valentini, Cristina Chiappini, Hans Van, Winckel

TL;DR
This paper provides a high-precision, well-calibrated set of metal-poor giant and CEMP star standards with accurate atmospheric parameters, crucial for spectroscopic surveys and chemical abundance studies.
Contribution
It introduces 47 new metal-poor giants with accurately determined atmospheric parameters using advanced 3D non-LTE modeling, expanding the existing standard star sample.
Findings
$T_{ ext{eff}}$ matches interferometry and IRFM within ±46 K.
Surface gravity ($ ext{log } g$) uncertainty is ±0.15 dex.
Metallicity ([Fe/H]) uncertainty is ±0.09 dex.
Abstract
Representative samples of F-, G-, K-type stars located out of the Solar Neighbourhood has started to be available in spectroscopic surveys. The fraction of metal-poor ([Fe/H]~~dex) giants becomes increasingly relevant to far distances. In metal-poor stars, effective temperatures () based on LTE spectroscopy and on former colour- relations of still wide use have been reported to be inaccurate. It is necessary to re-calibrate chemical abundances based on these scales in the multiple available surveys to bring them to the same standard scale for their simultaneous use. For that, a complete sample of standards is required, which so far, is restricted to a few stars with quasi-direct measurements. We aim at providing a legacy sample of metal-poor standards with proven accurate atmospheric parameters. We…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · History and Developments in Astronomy
