English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Context. Abundances of s- and r-process elements in Sun-like stars constrainnucleosynthesis in extreme astrophysical events, such as compact binary mergersand explosions of highly magnetised rapidly rotating massive stars.  Aims. We measure solar abundances of yttrium (Y) and europium (Eu) using 3Dnon-local thermal equilibrium (NLTE) models. We use the model to determine theabundance of Y, and also explore the model's ability to reproduce the solarcentre-to-limb variation of its lines. In addition, we determine the Euabundance using solar disc-centre and integrated flux spectra.  Methods. We developed an NLTE model of Eu and updated our model of Y withcollisional data from detailed quantum-mechanical calculations. We used the IAGspatially resolved high-resolution solar spectra to derive the solar abundancesof Y across the solar disc and of Eu for integrated flux and at disc centreusing a set of carefully selected lines and a 3D radiation-hydrodynamics modelof the solar atmosphere.  Results. We find 3D NLTE solar abundances of A(Y)$_{\textrm{3D NLTE}}$=$2.30\pm 0.03_{\textrm{stat}} \pm 0.07_{\textrm{syst}}$ dex based on observations atall angles and A(Eu)$_{\textrm{3D NLTE}}$=$0.57 \pm 0.01_{\textrm{stat}} \pm0.06_{\textrm{syst}}$ dex based on the integrated flux and disc-centreintensity. 3D NLTE modelling offers the most consistent abundances across thesolar disc, and resolves the problem of severe systematic bias in Y and Euabundances inherent to 1D LTE, 1D NLTE, and 3D LTE modelling.

3D NLTE modelling of Y and Eu. Centre-to-limb variation and solar abundances