Atomic data; Line: formation; Methods: observational; Sun: abundances; Sun: atmosphere; Line formations; Methods:observational; Nonlocal thermal equilibrium; S-process; Solar abundances; Solar disk; Thermal equilibrium models; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.SR
Abstract :
[en] Context. Abundances of s- and r-process elements in Sun-like stars constrain nucleosynthesis in extreme astrophysical events, such as compact binary mergers and explosions of highly magnetised rapidly rotating massive stars. Aims. We measure solar abundances of yttrium (Y) and europium (Eu) using 3D non-local thermal equilibrium (NLTE) models. We use the model to determine the abundance of Y, and also explore the model's ability to reproduce the solar centre-to-limb variation of its lines. In addition, we determine the Eu abundance using solar disc-centre and integrated flux spectra. Methods. We developed an NLTE model of Eu and updated our model of Y with collisional data from detailed quantum-mechanical calculations. We used the IAG spatially resolved high-resolution solar spectra to derive the solar abundances of Y across the solar disc and of Eu for integrated flux and at disc centre using a set of carefully selected lines and a 3D radiation-hydrodynamics model of the solar atmosphere. Results. We find 3D NLTE solar abundances of A(Y)3D NLTE = 2.30 ± 0.03stat ± 0.07syst dex based on observations at all angles and A(Eu) = 0.57 ± 0.01stat ± 0.06syst dex based on the integrated flux and disc-centre intensity. 3D NLTE modelling offers the most consistent abundances across the solar disc, and resolves the problem of severe systematic bias in Y and Eu abundances inherent to 1D LTE, 1D NLTE, and 3D LTE modelling.
Disciplines :
Physics
Author, co-author :
Storm, N. ; Max-Planck Institute for Astronomy, Heidelberg, Germany
Barklem, P.S. ; Theoretical Astrophysics, Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
Yakovleva, S.A.; Institute of Physics, Herzen University, St. Petersburg, Russian Federation
Belyaev, A.K.; Institute of Physics, Herzen University, St. Petersburg, Russian Federation
Palmeri, P.; Physique Atomique et Astrophysique, Université de Mons-UMONS, Mons, Belgium
Quinet, Pascal ; Université de Liège - ULiège > Département de physique > Spectroscopie atomique et Physique des atomes froids ; Physique Atomique et Astrophysique, Université de Mons-UMONS, Mons, Belgium
Lodders, K. ; Planetary Chemistry Laboratory, Dept of Earth & Planetary Sciences, McDonnell Center for Space Sciences, Washington Univ, St Louis, United States
Bergemann, M.; Max-Planck Institute for Astronomy, Heidelberg, Germany
Hoppe, R. ; Max-Planck Institute for Astronomy, Heidelberg, Germany
Language :
English
Title :
3D NLTE modelling of Y and Eu: Centre-to-limb variation and solar abundances
ERC - European Research Council DAAD - German Academic Exchange Service Sverige Vetenskapsrådet KAW - Knut och Alice Wallenbergs Stiftelse RSCA - Research Corporation for Science Advancement
Funding text :
M.B. is supported through the Lise Meitner grant from the Max Planck Society. This project has received funding from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (Grant agreement No. 949173). We acknowledge support from the DAAD grant Project No.: 57654415. P.P. and P.Q. are, respectively, Research Associate and Research Director of the Belgian Fund for Scientific Research F.R.S. - FNRS. P.S.B. acknowledges support from the Swedish Research Council through an individual project grant with contract no. 202003404, and support through the project \u201CProbing charge- and mass-transfer reactions on the atomic level\u201D, from the Knut and Alice Wallenberg Foundation (2018.0028). S.A.Y. and A.K.B. gratefully acknowledge Project No. 22-23-01181 support (RScF). We sincerely thank the referee for the positive feedback and comments that improved the readability of the paper.
