Non-local thermodynamical equilibrium abundance analysis of singly ionized praseodymium for the Sun

• DOI: 10.1093/mnras/staa1825
• Publication Date: 2020-06-23T19:17:03Z
• Authors: Abdelrazek M K Sh...; Ali G A Abdelkawy; M M Beheary
• Keywords: Praseodymium; Solar atmosphere

ABSTRACT Determinations of the solar abundance praseodymium (Pr) depend critically on local thermodynamical equilibrium (LTE) and non-local (NLTE) techniques beyond capabilities a classical one-dimensional model atmosphere. Here, in this analysis, we adopt an atomic atom Pr consisting 105 energy levels 14 bound–bound transitions singly ionized (Pr ii) ground state iii continuum limit. We briefly analyse taking atmospheres Holweger & Müller (1974, Solar Physics, 39, 19) with measured equivalent linewidths invoking microturbulent velocity treatment. succeed accurately selecting nearby clear sections spectrum for spectral lines ii improved data high-quality oscillator strengths available from laboratory measurements several possible sources as well accurate damping constants successfully determined literature. find revised to be downwards log ϵPr(NLTE) = 0.75 ± 0.09, which is good agreement meteoritic value (log ϵPr 0.76 0.03). A comparison NLTE corrections standard LTE ϵPr(LTE) 0.74 0.08, reveals positive correction +0.01 dex, estimated selected lines. The clearly superior following Müller, absolute scales gf-values, adopted linewidths.