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The Milky Way's metal-poor stars are nearby ancient objects that are used tostudy early chemical evolution and the assembly and structure of the Milky Way.Here we present reliable metallicities of $\sim280,000$ stars with $-3.75\lesssim$ [Fe/H] $\lesssim -0.75$ down to $g=17$ derived usingmetallicity-sensitive photometry from the second data release (DR2) of theSkyMapper Southern Survey. We use the dependency of the flux through theSkyMapper $v$ filter on the strength of the Ca II K absorption features, intandem with SkyMapper $u,g,i$ photometry, to derive photometric metallicitiesfor these stars. We find that metallicities derived in this way compare well tometallicities derived in large-scale spectroscopic surveys, and use suchcomparisons to calibrate and quantify systematics as a function of location,reddening, and color. We find good agreement with metallicities from theAPOGEE, LAMOST, and GALAH surveys, based on a standard deviation of$\sigma\sim0.25$dex of the residuals of our photometric metallicities withrespect to metallicities from those surveys. We also compare our derivedphotometric metallicities to metallicities presented in a number ofhigh-resolution spectroscopic studies to validate the low metallicity end([Fe/H] $< -2.5$) of our photometric metallicity determinations. In suchcomparisons, we find the metallicities of stars with photometric [Fe/H] $<-2.5$ in our catalog show no significant offset and a scatter of$\sigma\sim$0.31dex level relative to those in high-resolution work whenconsidering the cooler stars ($g-i > 0.65$) in our sample. We also present anexpanded catalog containing photometric metallicities of $\sim720,000$ stars asa data table for further exploration of the metal-poor Milky Way.

the astrophysical journal. supplement series/astrophysical journal. supplement series

Stellar Metallicities from SkyMapper Photometry II: Precise photometric  metallicities of $\sim$280,000 giant stars with [Fe/H] $< -0.75$ in the Milky  Way