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BAWLAS: a Catalog of Chemical abundances for Weak and Blended Elements in APOGEE Spectra

Abstract:

Elements with weak or blended lines are typically challenging to measure with the standard pipelines of spectroscopic surveys because these lines require a special treatment to measure precise chemical abundances. However, measuring the abundances of additional elements can open up opportunities to study a variety of topics from nuclear physics to Galactic chemical evolution. We present an analysis of high signal-to-noise spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey for~ 120,000 red giant stars. To improve upon standard pipelines, we measure line-by-line abundances with the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS) and we employ a dedicated set of line quality flags as well as a prescription for identifying upper limits to provide precise abundance measurements. We use this methodology to create the BACCHUS …