BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)

Abstract

Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure their chemical abundances. In this work, we have created a catalog of approximately 120,000 giants with high signal-to-noise APOGEE DR17 spectra, for which we explore weak and blended species to measure Na, P, S, V, Cu, Ce, and Nd abundances and ${}^{12}$C/${}^{13}$C isotopic ratios. We employ an updated version of the BACCHUS (Brussels Automatic Code for Characterizing High accUracy Spectra) code to derive these abundances using the stellar parameters measured by APOGEE's DR17 ASPCAP pipeline, quality flagging to identify suspect spectral lines, and a prescription for upper limits. Combined these allow us to provide our BACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS) catalog of precise chemical abundances for these weak and blended species that agrees well with literature and improves upon APOGEE abundances for these elements, some of which are unable to be measured with APOGEE's current, grid-based approach without computationally expensive expansions. This new catalog can be used alongside APOGEE and provide measurements for many scientific applications ranging from nuclear physics to Galactic chemical evolution and Milky Way population studies. To illustrate this we show some examples of uses for this catalog, such as, showing that we observe stars with enhanced s-process abundances or that we can use the our ${}^{12}$C/${}^{13}$C ratios to explore extra mixing along the red giant branch.

49 Pages, 30 figures, 7 Tables. Accepted for publishing in The Astrophysical Journal Supplement Series. The BAWLAS chemical abundance catalog to be made publicly available as an SDSS DR17 value-added catalog: https://www.sdss.org/dr17/data_access/value-added-catalogs/

References in corpus (40)

• The NumPy array: a structure for efficient numerical computation
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The GALAH Survey: Scientific Motivation
• A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Thermohaline mixing: A physical mechanism governing the photospheric composition of low-mass giants
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• 4MOST: Project overview and information for the First Call for Proposals
• Target Selection for the SDSS-IV APOGEE-2 Survey
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program II: Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd and Eu
• Sulphur and zinc abundances in Galactic halo stars revisited
• Can Extra Mixing in RGB and AGB Stars Be Attributed to Magnetic Mechanisms?
• APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites
• Exploring Anticorrelations and Light Element Variations in Northern Globular Clusters Observed by the APOGEE Survey
• Disentangling the Galactic Halo with APOGEE: I. Chemical and Kinematical Investigation of Distinct Metal-Poor Populations
• Chemical evolution with rotating massive star yields II. A new assessment of the solar s- and r- process components
• New H-band Stellar Spectral Libraries for the SDSS-III/APOGEE survey
• Light, Alpha, and Fe-Peak Element Abundances in the Galactic Bulge
• The origin and evolution of the odd-Z iron-peak elements Sc, V, Mn, and Co in the Milky Way stellar disk
• Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
• Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
• A homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code. I. The Northern clusters
• Constraining Metallicity-dependent Mixing and Extra Mixing using [C/N] in Alpha-Rich Field Giants
• On the Numerical Treatment and Dependence of Thermohaline Mixing in Red Giants
• The Chemical Composition of the Galactic Bulge and Implications for its Evolution
• Detection of Neutral Phosphorus in the Near Ultraviolet Spectra of Late-Type Stars
• Chemical Cartography with APOGEE: Mapping Disk Populations with a Two-Process Model and Residual Abundances
• Abundances of disk and bulge giants from high-resolution optical spectra -- IV. Zr, La, Ce, Eu
• Galactic evolution of Copper in the light of NLTE computations
• C, N, O abundances and carbon isotope ratios in evolved stars of the open clusters Collinder 261 and NGC 6253
• Abundances of disk and Bulge giants from high-resolution optical spectra III. Sc, V, Cr, Mn, Co, Ni
• Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur
• Abundances of disk and bulge giants from hi-res optical spectra: II. O, Mg, Ca, and Ti in the bulge sample
• Non-LTE analysis of neutral copper in the late-type metal-poor stars
• 12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791
• Phosphorus Abundances in the Hyades and Galactic Disk
• Systematic investigation of chemical abundances derived using IR spectra obtained with GIANO
• HERBS II: Detailed chemical compositions of Galactic bulge stars
• NLTE Analysis of Copper Abundances in the Galactic Bulge Stars

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• Origin of neutron capture elements with the Gaia-ESO survey: the evolution of s- and r-process elements across the Milky Way
• The Galactic Chemical Evolution of phosphorus observed with IGRINS
• Stragglers of the thick disc
• Characterizing Observed Extra Mixing Trends in Red Giants using the Reduced Density Ratio from Thermohaline Models
• The impact of carbon and oxygen abundances on the metal-poor initial mass function
• Time evolution of Ce as traced by APOGEE using giant stars observed with the Kepler, TESS and K2 missions
• Chemical Cartography with APOGEE: Two-process Parameters and Residual Abundances for 288,789 Stars from Data Release 17
• Untangling the Sources of Abundance Dispersion in Low-Metallicity Stars
• Unveiling the chemical fingerprint of phosphorus-rich stars I. In the infrared region of APOGEE-2
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data I. Method validation
• Studying stellar populations in Omega Centauri with phylogenetics
• CAPOS: The bulge Cluster APOgee Survey VIII. Final ASPCAP results for all clusters
• Chemical tagging with APOGEE, MUSE, and HST: constraints on the formation of $\omega$ Centauri
• M giants with IGRINS IV. Identification and characterization of a near-IR line of the s-element Barium
• Dynamical mass of a solar-like oscillator at the main-sequence turnoff from Gaia astrometry & ground-based spectroscopy