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The radius and mass of the close solar twin 18 Sco derived from asteroseismology and interferometry
M. Bazot, M. J. Ireland, D. Huber +28
The growing interest in solar twins is motivated by the possibility of comparing them directly to the Sun. To carry on this kind of analysis, we need to know their physical charact…
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…
The remarkable solar twin HIP 56948: a prime target in the quest for other Earths
Jorge Melendez, Maria Bergemann, Judith G. Cohen +8
We study HIP 56948, the best solar twin known to date, to determine with an unparalleled precision how similar is to the Sun in its physical properties, chemical composition and pl…
Three-dimensional interferometric, spectrometric, and planetary views of Procyon
A. Chiavassa, L. Bigot, P. Kervella +5
We used a new realistic 3D radiative-hydrodynamical model atmosphere of Procyon generated with the Stagger Code and synthetic spectra computed with the radiative transfer code Opti…