The APOGEE Data Release 16 Spectral Line List

June 2021 • 2021AJ....161..254S

Authors • Smith, Verne V. • Bizyaev, Dmitry • Cunha, Katia • Shetrone, Matthew D. • Souto, Diogo • Allende Prieto, Carlos • Masseron, Thomas • Mészáros, Szabolcs • Jönsson, Henrik • Hasselquist, Sten • Osorio, Yeisson • García-Hernández, D. A. • Plez, Bertrand • Beaton, Rachael L. • Holtzman, Jon • Majewski, Steven R. • Stringfellow, Guy S. • Sobeck, Jennifer

Abstract • The updated H-band spectral-line list (from λ15000-17000) adopted by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) for the SDSS-IV Data Release 16 (DR16) is presented in this work. The APOGEE line list is a combination of atomic and molecular lines, with data drawn from laboratory, theoretical, and astrophysical sources. Oscillator strengths and damping constants are adjusted using high signal-to-noise, high-resolution spectra of the Sun, and α Boo (Arcturus), as "standard stars." Updates to the DR16 line list, as compared to the previous DR14 version, include the addition of molecular H₂O and FeH lines, as well as a much larger (by a factor of ∼4) atomic line list, including a significantly greater number of transitions with hyperfine splitting. More recent references and line lists for the crucial molecules, CO and OH, as well as for C₂ and SiH, are also included. In contrast to DR14, DR16 contains measurable lines from the heavy neutron-capture elements cerium (as Ce II), neodymium (as Nd II), and ytterbium (as Yb II), as well as one line from rubidium (as Rb I), which may be detectable in a small fraction of APOGEE red giants.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2021AJ....161..254S
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/abefdc/pdf
• PDF https://stacks.iop.org/1538-3881/161/254/pdf
• PREPRINT http://arxiv.org/abs/2103.10112
• ELECTR https://doi.org/10.3847%2F1538-3881%2Fabefdc