Star Formation History in the Galactic Thin Disk
V.A. Marsakov, M.V. Shapovalov, T.V. Borkova

TL;DR
This study investigates the star formation history in the Galactic thin disk, revealing a decreasing star formation rate with radius, a negative metallicity gradient, and changes in chemical abundances over billions of years influenced by galactic interactions.
Contribution
It provides new insights into the temporal and spatial variations of star formation and chemical enrichment in the Galactic thin disk, highlighting the impact of galactic interactions.
Findings
Star formation rate decreases with Galactocentric distance.
Metallicity shows a negative radial gradient, while magnesium abundance does not.
Star formation increased around 5 billion years ago, affecting chemical properties.
Abstract
The behavior of the relative magnesium abundances in the thin-disk stars versus their orbital radii suggests that the star formation rate in the thin disk decreases with increasing Galactocentric distance, and there was no star formation for some time outside the solar circle while this process was continuous within the solar circle. The decrease in the star formation rate with increasing Galactocentric distance is responsible for the existence of a negative radial metallicity gradient in the thin disk. At the same time the relative magnesium abundance exhibits no radial gradient. It is in detail considered the influence of selective effects on the form of both age - metallicity and age - relative magnesium abundance diagrams. It is shown that the first several billion years of the formation of the thin disk interstellar medium in it was on the average sufficiently rich in heavy…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies
