JINAbase: A database for chemical abundances of metal-poor stars

TL;DR

JINAbase is a comprehensive, queryable database of chemical abundances and stellar parameters for 1658 metal-poor stars, facilitating research on the Milky Way's chemical evolution and nucleosynthesis.

Contribution

It provides the first extensive, publicly accessible database of metal-poor star abundances with a user-friendly web interface for research and comparison.

Findings

Systematic uncertainties in abundance measurements evaluated

Database includes diverse stellar classifications like r-process and CEMP stars

Enables rapid selection of comparison samples for chemical evolution studies

Abstract

Reconstructing the chemical evolution of the Milky Way is crucial for understanding the formation of stars, planets, and galaxies throughout cosmic time. Different studies associated with element production in the early universe and how elements are incorporated into gas and stars are necessary to piece together how the elements evolved. These include establishing chemical abundance trends, as set by metal-poor stars, comparing nucleosynthesis yield predictions with stellar abundance data, and theoretical modeling of chemical evolution. To aid these studies, we have collected chemical abundance measurements and other information such as stellar parameters, coordinates, magnitudes, and radial velocities, for extremely metal-poor stars from the literature. The database, JINAbase, contains 1658 unique stars, 60% of which have [Fe/H]<2.5. This information is stored in an SQL database, together with a user-friendly queryable web application (http://jinabase.pythonanywhere.com). Objects with unique chemical element signatures (e.g., r-process stars, s-process and CEMP stars) are labeled or can be classified as such. The web application enables fast selection of customized comparison samples from the literature for the aforementioned studies and many more. Using the multiple entries for three of the most well studied metal-poor stars, we evaluate systematic uncertainties of chemical abundances measurements. We provide a brief guide on the selection of chemical elements for model comparisons for non- spectroscopists who wish to learn about metal-poor stars and the details of chemical abundances measurements.