GALA: an automatic tool for the abundance analysis of stellar spectra

Abstract

GALA is a freely distributed Fortran code to derive automatically the atmospheric parameters (temperature, gravity, microturbulent velocity and overall metallicity) and abundances for individual species of stellar spectra using the classical method based on the equivalent widths of metallic lines. The abundances of individual spectral lines are derived by using the WIDTH9 code developed by R. L. Kurucz. GALA is designed to obtain the best model atmosphere, by optimizing temperature, surface gravity, microturbulent velocity and metallicity, after rejecting the discrepant lines. Finally, it computes accurate internal errors for each atmospheric parameter and abundance. The code permits to obtain chemical abundances and atmospheric parameters for large stellar samples in a very short time, thus making GALA an useful tool in the epoch of the multi-object spectrographs and large surveys. An extensive set of tests with both synthetic and observed spectra is performed and discussed to explore the capabilities and robustness of the code.

15 pages, 12 figures, accepted for publication in ApJ

References in corpus (9)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The Radial Velocity Experiment (RAVE): first data release
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• New ATLAS9 And MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectra
• Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm
• Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
• ARGOS II: The Galactic Bulge Survey
• SPADES: Stellar Parameters Determination Software

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