Abundance analysis of neodymium in the solar atmosphere

作者：Abdelkawy Ali G A^*; Shaltout Abdelrazek M K^*; Beheary M M; Bakry A

来源：Monthly Notices of the Royal Astronomical Society, 2017, 470(4): 4007-4014.

DOI：10.1093/mnras/stx1407

• atomic data
• atomic processes
• line: formation
• Sun: abundances
• Sun: atmosphere
• Sun: photosphere

Based on non-local thermodynamical equilibrium (NLTE) calculations, the solar neodymium (Nd) content was found based on a model atom of singly ionized neodymium (Nd II) containing 153 energy levels and 42 line transitions plus the ground state of Nd III. Here, we re-derive the solar Nd abundance using the model of the solar photosphere of Holweger & Muller. We succeed in selecting a good sample line list, relying on 20 Nd II solar lines together with the most accurate transition probabilities measured experimentally and available observational data. With damping parameters obtained from the literature, we find a mean NLTE solar photospheric Nd abundance of log epsilon(Nd)(1D) = 1.43 +/- 0.16, which is in excellent agreement with the meteoritic value (log epsilon(Nd) = 1.45 +/- 0.02). For a set of selected Nd II lines, the NLTE abundance correction is found to be +0.01 dex compared with the standard LTE effect. The influence of collisional interactions with electrons and neutral hydrogen atoms is investigated in detail.

• 出版日期2017-10