Title: SDSS-IV MaStar: theoretical atmospheric parameters for the MaNGA stellar library

Abstract

ABSTRACT We calculate the fundamental stellar parameters effective temperature, surface gravity, and iron abundance – Teff, 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 ∼ 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 ofmore » the literature surveys, are favourable in all cases. Our final parameter catalogue for MaStar cover the following ranges: 2592 ≤ Teff ≤ 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.« less

Authors:

Hill, Lewis  ^[1];

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Thomas, Daniel  ^[2];

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Maraston, Claudia ^[1]; Yan, Renbin  ^[3];

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Neumann, Justus  ^[1];

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Lundgren, Andrew ^[1]; Lazarz, Daniel ^[3]; Chen, Yan-Ping ^[4]; Cappellari, Michele  ^[5];

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Holtzman, Jon A. ^[6]; Imig, Julie ^[6]; Cunha, Katia ^[7]; Stringfellow, Guy  ^[8];

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Bizyaev, Dmitry  ^[9];

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Law, David R. ^[10]; Stassun, Keivan G.  ^[11];

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Drory, Niv ^[12]; Merrifield, Michael  ^[13];

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Beers, Timothy C. ^[14]

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+ Show Author Affiliations

1. Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, UK
2. Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, UK, School of Mathematics and Physics, University of Portsmouth, Lion Gate Building, Portsmouth PO1 3HF, UK
3. Department of Physics and Astronomy, University of Kentucky, 505 Rose Street, Lexington, KY 40506-0055, USA
4. Center for Astro, Particle and Planetary Physics, New York University Abu Dhabi, Abu Dhabi P.O. Box 129188, United Arab Emirates
5. Sub-Department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
6. Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA
7. Observatório Nacional/MCTIC, R. Gen. José Cristino, 77, 20921-400 Rio de Janeiro, Brazil, Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA
8. Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA
9. Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM 88349, USA, Sternberg Astronomical Institute, Moscow State University, Universitetskij pr. 13, Moscow 19992, Russia
10. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
11. Vanderbilt University Physics and Astronomy Department, 6301 Stevenson Center Ln. Nashville, TN 37235, USA
12. McDonald Observatory, The University of Texas at Austin, 1 University Station, Austin, TX 78712, USA
13. School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
14. Department of Physics and JINA Center for the Evolution of the Elements, University of Notre Dame, Notre Dame, IN 46556, USA

Publication Date:

2021-11-12

Sponsoring Org.:

USDOE

OSTI Identifier:

1834231

Resource Type:

Published Article

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 509 Journal Issue: 3; Journal ID: ISSN 0035-8711

Publisher:

Oxford University Press

Country of Publication:

United Kingdom

Language:

English