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Unveiling systematic biases in 1D LTE excitation-ionisation balance of Fe for FGK stars. A novel approach to determination of stellar parameters
Gregory R. Ruchti, Maria Bergemann, Aldo Serenelli +2
We present a comprehensive analysis of different techniques available for the spectroscopic analysis of FGK stars, and provide a recommended methodology which efficiently estimates…
NLTE line formation of Fe for late-type stars. I. Standard stars with 1D and <3D> model atmospheres
Maria Bergemann, Karin Lind, Remo Collet +2
We investigate departures from LTE in the line formation of Fe for a number of well-studied late-type stars in different evolutionary stages. A new model of Fe atom was constructed…
NLTE line formation of Fe in late-type stars II: 1D spectroscopic stellar parameters
Karin Lind, Maria Bergemann, Martin Asplund
We investigate departures from local thermodynamic equilibrium (NLTE) in the line formation of neutral and singly ionised iron lines and their impact on spectroscopic stellar param…
Red Supergiant Stars as Cosmic Abundance Probes: NLTE Effects in J-band Iron and Titanium Lines
Maria Bergemann, Rolf-Peter Kudritzki, Bertrand Plez +3
Detailed non-LTE calculations for red supergiant stars are presented to investigate the influence of NLTE on the formation of atomic iron and titanium lines in the J-band. With the…
A super-Li rich turnoff star in NGC 6397 - the puzzle persists
Andreas Koch, Karin Lind, Ian B. Thompson +1
This presentation focuses on a recently discovered super-Li rich turnoff star in the old, metal poor globular cluster NGC 6397 (Koch et al. 2011, ApJL, 738, L29). Its unusually hig…