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Double Trouble: How Unresolved Spectroscopic Binary Stars Skew GALAH DR4 Stellar Parameters
Unresolved binary stars introduce systematic biases in stellar parameter estimates when analysed assuming a single star. Using $\sim$917{,}000 spectra from the Galactic Archaeology with HERMES (GALAH) Data Release 4 (DR4), we develop a binary spectral model that fits each observed spectrum as the su
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