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The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission

M. R. Gent, M. Bergemann, A. M. Serenelli, L. Casagrande, J. M. Gerber, U. Heiter, M. Kovalev, T. Morel, N. Nardetto, V. Zh. Adibekyan, V. Silva Aguirre, M. Asplund, K. Belkacem, C. del Burgo, L. Bigot, A. Chiavassa, L. F. Rodríguez Díaz, M.-J. Goupil, J. I. González Hernández, D. Mourard, T. Merle, S. Mészáros, D. J. Marshall, R.-M. Ouazzani, B. Plez, D. R. Reese, R. Trampedach, M. Tsantaki

We introduce the SAPP (Stellar Abundances and atmospheric Parameters Pipeline), the prototype of the code that will be used to determine parameters of stars observed within the core program of the PLATO space mission. The pipeline is based on the Bayesian inference and provides effective temperature, surface gravity, metallicity, chemical abundances, and luminosity. The code in its more general version has a much wider range of potential applications. It can also provide masses, ages, and radii of stars and can be used with stellar types not targeted by the PLATO core program, such as red giants. We validate the code on a set of 27 benchmark stars that includes 19 FGK-type dwarfs, 6 GK-type subgiants, and 2 red giants. Our results suggest that combining various observables is the optimal approach, as this allows the degeneracies between different parameters to be broken and yields more accurate values of stellar parameters and more realistic uncertainties. For the PLATO core sample, we obtain a typical uncertainty of 27 (syst.) ± 37 (stat.) K for Teff, 0.00 ± 0.01 dex for log g, 0.02 ± 0.02 dex for metallicity [Fe/H], −0.01 ± 0.03 R for radii, −0.01 ± 0.05 M for stellar masses, and −0.14 ± 0.63 Gyr for ages. We also show that the best results are obtained by combining the νmax scaling relation with stellar spectra. This resolves the notorious problem of degeneracies, which is particularly important for F-type stars.

surveys / stars: fundamental parameters / stars: solar-type / stars: abundances / stars: atmospheres

Astronomy & Astrophysics
Volume 658, Article Number A147, Number of pages 23
2022 February

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia