open access publication

Article, 2023

Non-LTE radiative transfer with Turbospectrum

ASTRONOMY & ASTROPHYSICS, ISSN 0004-6361, 0004-6361, Volume 669, 10.1051/0004-6361/202243673

Contributors

Gerber, Jeffrey M. 0000-0001-9583-0004 (Corresponding author) [1] Magg, Ekaterina [1] Plez, Bertrand [2] [3] Bergemann, M. 0000-0002-9908-5571 [1] [4] [5] Heiter, U. [6] Olander, Terese [6] Hoppe, R. [1]

Affiliations

  1. [1] Max Planck Inst Astron, D-69117 Heidelberg, Germany
  2. [NORA names: Germany; Europe, EU; OECD];
  3. [2] Univ Montpellier, LUPM, CNRS, Montpellier, France
  4. [NORA names: France; Europe, EU; OECD];
  5. [3] Univ Montpellier, LUPM, CNRS, Montpellier, France
  6. [NORA names: France; Europe, EU; OECD];
  7. [4] Univ Copenhagen, Niels Bohr Inst, Niels Bohr Int Acad, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
  8. [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD];
  9. [5] Univ Copenhagen, Niels Bohr Inst, Niels Bohr Int Acad, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
  10. [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD];

Abstract

Physically realistic models of stellar spectra are needed in a variety of astronomical studies, from the analysis of fundamental stellar parameters, to studies of exoplanets and stellar populations in galaxies. Here we present a new version of the widely used radiative transfer code Turbospectrum, which we update so that it is able to perform spectrum synthesis for lines of multiple chemical elements in non-local thermodynamic equilibrium (NLTE). We use the code in the analysis of metallicites and abundances of the Gaia FGK benchmark stars, using 1D MARCS atmospheric models and the averages of 3D radiation-hydrodynamics simulations of stellar surface convection. We show that the new more physically realistic models offer a better description of the observed data, and we make the program and the associated microphysics data publicly available, including grids of NLTE departure coefficients for H, O, Na, Mg, Si, Ca, Ti, Mn, Fe, Co, Ni, Sr, and Ba.

Keywords

Sun, abundances, methods, observational, spectroscopic, stars, techniques

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