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32 papers · 2 filters
An empirical recipe for inelastic hydrogen-atom collisions in non-LTE calculations
Rana Ezzeddine, Thibault Merle, Bertrand Plez +3
We investigate the role of hydrogen collisions in NLTE spectral line synthesis, and introduce a new general empirical recipe to determine inelastic charge transfer (CT) and bound-b…
Characterizing solar-type stars from full-length Kepler data sets using the Asteroseismic Modeling Portal
Orlagh Creevey, Travis S. Metcalfe, Mathias Schultheis +6
The Kepler space telescope yielded unprecedented data for the study of solar-like oscillations in other stars. The large samples of multi-year observations posed an enormous data a…
The AMBRE project: Iron-peak elements in the solar neighbourhood
Š. Mikolaitis, P. de Laverny, A. Recio-Blanco +3
The aim of this paper is to characterise the abundance patterns of five iron-peak elements (Mn, Fe, Ni, Cu, and Zn) for which the stellar origin and chemical evolution are still de…
Proxima's orbit around Alpha Centauri
P. Kervella, F. Thévenin, C. Lovis
Proxima and Alpha Centauri AB have almost identical distances and proper motions with respect to the Sun. Although the probability of such similar parameters is in principle very l…
The radii and limb darkenings of Alpha Centauri A and B - Interferometric measurements with VLTI/PIONIER
P. Kervella, L. Bigot, A. Gallenne +1
The photospheric radius is one of the fundamental parameters governing the radiative equilibrium of a star. We report new observations of the nearest solar-type stars Alpha Centaur…
Close stellar conjunctions of alpha Centauri A and B until 2050 - An mK = 7.8 star may enter the Einstein ring of alpha Cen A in 2028
P. Kervella, F. Mignard, A. Mérand +1
The rapid proper motion of the alpha Cen pair (3.7 arcsec/yr) and its location close to the galactic plane on a rich stellar background combine to make them excellent candidates fo…