TY - JOUR
T1 - Non-LTE radiative transfer with Turbospectrum
AU - Gerber, Jeffrey M. M.
AU - Magg, Ekaterina
AU - Plez, Bertrand
AU - Bergemann, Maria
AU - Heiter, Ulrike
AU - Olander, Terese
AU - Hoppe, Richard
PY - 2023/1/6
Y1 - 2023/1/6
N2 - 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.
AB - 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.
KW - stars
KW - abundances
KW - techniques
KW - spectroscopic
KW - methods
KW - observational
KW - Sun
KW - RELATIVE OSCILLATOR-STRENGTHS
KW - LATE-TYPE STARS
KW - SAMPLING MODEL ATMOSPHERES
KW - FE-I TRANSITIONS
KW - COOL DWARF STARS
KW - LINE FORMATION
KW - EFFECTIVE TEMPERATURES
KW - PRECISION-MEASUREMENT
KW - CHEMICAL-COMPOSITION
KW - STELLAR EVOLUTION
U2 - 10.1051/0004-6361/202243673
DO - 10.1051/0004-6361/202243673
M3 - Journal article
SN - 0004-6361
VL - 669
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A43
ER -