Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 509, Issue 3, Pages 4308-4329Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab3263
Keywords
techniques: spectroscopic; stars: abundances; stars: atmospheres; stars: evolution; stars: fundamental parameters; galaxies: stellar content
Categories
Funding
- Science & Technology Facilities Council (STFC)
- Data Intensive Science Centre in SEPnet (DISCnet)
- Consolidated Grant Cosmology and Astrophysics at Portsmouth [ST/S000550/1]
- NSF [AST-1715898]
- ICG
- SEPNet
- University of Portsmouth
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office ocience
- Center for High Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Center for Astrophysics \ Harvard Smithsonian
- Chilean Participation Group
- French Participation Group
- Instituto de Astrofisica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU) / University of Tokyo
- Korean Participation Group
- Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-Planck-Institut f ur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional / MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
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In this study, we calculated the fundamental stellar parameters, including effective temperature, surface gravity, and iron abundance, for the final release of the Mapping Nearby Galaxies at APO (MaNGA) Stellar Library (MaStar). We used theoretical spectra and a Bayesian approach with Markov Chain Monte Carlo techniques to obtain uncertainties in the parameter values. The results showed high reliability of the parameters for different stellar evolutionary phases.
We calculate the fundamental stellar parameters effective temperature, surface gravity, and iron abundance - T-eff, log g, [Fe/H] - for the final release of the Mapping Nearby Galaxies at APO (MaNGA) Stellar Library (MaStar), containing 59 266 per-visit-spectra for 24 290 unique stars at intermediate resolution (R similar to 1800) and high S/N (median = 96). We fit theoretical spectra from model atmospheres by both MARCS and BOSZ-ATLAS9 to the observed MaStar spectra, using the full spectral fitting code pPXF. We further employ a Bayesian approach, using a Markov Chain Monte Carlo (MCMC) technique to map the parameter space and obtain uncertainties. Originally in this paper, we cross match MaStar observations with Gaia photometry, which enable us to set reliable priors and identify outliers according to stellar evolution. In parallel to the parameter determination, we calculate corresponding stellar population models to test the reliability of the parameters for each stellar evolutionary phase. We further assess our procedure by determining parameters for standard stars such as the Sun and Vega and by comparing our parameters with those determined in the literature from high-resolution spectroscopy (APOGEE and SEGUE) and from lower resolution matching template (LAMOST). The comparisons, considering the different methodologies and S/N of the literature surveys, are favourable in all cases. Our final parameter catalogue for MaStar cover the following ranges: 2592 <= T-eff <= 32 983 K; -0.7 <= log g <= 5.4 dex; -2.9 <= [Fe/H] <= 1.0 dex and will be available with the last SDSS-IV Data Release, in 2021 December.
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