Speaker
Description
Galactic Archaeologists are opening a revolutionary era for the determination of stellar parameters, such as effective temperature, surface gravity, metallicity, and ages, for a substantial fraction of the stars in the Milky Way, and eventually in dwarf galaxies and other nearby galaxies of the Local Group. The most recent surveys implement a combination of narrow- and intermediate-band filters that further enable measurements of a subset of the most important elements for probing stellar populations, in addition to [Fe/H], such as [C/Fe], [N/Fe], [Mg/Fe], and [Ca/Fe]. The recently (or nearly) completed surveys, including the SkyMapper Southern Survey (SMSS) and The Stellar Abundances for Galactic Exploration Survey (SAGES) in the North, have already contributed over 50 million stars with estimates of [Fe/H]. The ongoing Javalambre Photometric Local Universe Survey (J-PLUS) and the Southern Local Universe Survey (S-PLUS) will contribute another 25 million stars with additional elemental abundances over the next two years. For those who hunger for the most chemically primitive stars, we have already identified over 1 million Very Metal-Poor stars with [Fe/H] < -2.0, and over 50,000 Extremely Metal-Poor stars with [Fe/H] < -3.0. Extension of these techniques to other large-scale surveys in the future will also be discussed.
