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Korg: a modern 1D LTE spectral synthesis package
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Korg: a modern 1D LTE spectral synthesis package
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We present Korg, a new package for 1D LTE (local thermodynamic equilibrium) spectral synthesis of FGK stars, which computes theoretical spectra from the near-ultraviolet to the near-infrared, and implements both plane-parallel and spherical radiative transfer. We outline the inputs and internals of Korg, and compare synthetic spectra from Korg, MOOG, Turbospectrum, and SME. The disagreements between Korg and the other codes are no larger than those between the other codes, although disagreement between codes is substantial. We examine the case of a C$_2$ band in detail, finding that uncertainties on physical inputs to spectral synthesis account for a significant fraction of the disagreement. Korg is 1-100 times faster than other codes in typical use, compatible with automatic differentiation libraries, and easily extensible, making it ideal for statistical inference and parameter estimation applied to large data sets. Documentation and installation instructions are available at https://ajwheeler.github.io/Korg.jl/stable/.
Forward citations
Cited by 2 Pith papers
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PANTERA. I. Hunting for the Most Metal-Rich Stars in the Solar Neighborhood with High-Resolution Spectroscopy
Gaia XP photometric metallicities overpredict iron abundance by ~0.16 dex for cool metal-rich giants, yet the sample still contains 25 ultra-metal-rich stars up to [Fe/H]=+0.58.
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HARPS Abundances with Korg I: 22 Element Abundances for 426 Red Giant Stars
A new 22-element abundance catalogue for 426 HARPS red giants built with Korg, with a claim that chemical space is effectively six-dimensional.
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