322 citations · 1.7k across the 16 of their papers we have counts for
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Non-LTE line formation for Pr II and Pr III in A and Ap stars
L. Mashonkina, T. Ryabchikova, A. Ryabtsev +1
Non-LTE line formation for Pr II and Pr III is considered through a range of effective temperatures between 7250 K and 9500 K. A comprehensive model atom for Pr II/III is based on…
Statistical equilibrium of silicon in the solar atmosphere
J. R. Shi, T. Gehren, K. Butler +2
The statistical equilibrium of neutral and ionised silicon in the solar photosphere is investigated. Line formation is discussed and the solar silicon abundance determined. High-re…
Non-LTE line formation for heavy elements in four very metal-poor stars
L. Mashonkina, G. Zhao, T. Gehren +6
Stellar parameters and abundances of Na, Mg, Al, K, Ca, Sr, Ba, and Eu are determined for four very metal-poor stars (-2.66 < [Fe/H] < -2.15) based on non-LTE line formation and an…
Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
A. J. Korn, F. Grundahl, O. Richard +5
We present a homogeneous photometric and spectroscopic analysis of 18 stars along the evolutionary sequence of the metal-poor globular cluster NGC 6397 ([Fe/H] = -2), from the main…
New Abundances for Old Stars - Atomic Diffusion at Work in NGC 6397
A. J. Korn, F. Grundahl, O. Richard +5
A homogeneous spectroscopic analysis of unevolved and evolved stars in the metal-poor globular cluster NGC 6397 with FLAMES-UVES reveals systematic trends of stellar surface abunda…
A non-LTE study of neutral and singly-ionized calcium in late-type stars
L. Mashonkina, A. J. Korn, N. Przybilla
Non-local thermodynamical equilibrium (NLTE) line formation for neutral and singly-ionized calcium is considered through a range of spectral types when the Ca abundance varies from…