A Blueprint for the Milky Way's Stellar Populations. IV. A String of Pearls $-$ the Galactic Starburst Sequence
Deokkeun An, Timothy C. Beers, Young Sun Lee, Thomas Masseron

TL;DR
This paper analyzes the phase-space distribution of stars in the Milky Way, revealing a narrow velocity-metallicity sequence linked to the galaxy's starburst history and the GSE event, using improved photometric calibration methods.
Contribution
It introduces a new empirical calibration method for synthetic stellar spectra across multiple photometric systems, enabling detailed phase-space analysis of Milky Way stars.
Findings
Discovery of a narrow $v_\phi$-[Fe/H] sequence along GSE and Splash structures.
Identification of a rapid increase in rotational velocity in a specific metallicity range.
Evidence supporting a recent starburst event during the Milky Way's interaction with GSE.
Abstract
We continue our series of papers on phase-space distributions of stars in the Milky Way based on photometrically derived metallicities and Gaia astrometry, with a focus on the halo-disk interface in the local volume. To exploit various photometric databases, we develop a method of empirically calibrating synthetic stellar spectra based on a comparison with observations of stellar sequences and individual stars in SDSS, SMSS, and PS1, overcoming band-specific corrections employed in our previous work. In addition, photometric zero-point corrections are derived to provide an internally consistent photometric system with a spatially uniform metallicity zero point. Using our phase-space diagrams, we find a remarkably narrow sequence in the rotational velocity () versus metallicity ([Fe/H]) space for a sample of high proper-motion stars ( mas yr), which runs along Gaia…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
