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- Centre National de la Recherche ScientifiqueFR519 papers
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18 papers · 2 filters
Stellar magnetic activity and their influence on the habitability of exoplanets
T. Lüftinger, M. Güdel, C. P. Johnstone
Stellar magnetism, explorable via polarimetry, is a crucial driver of activity, ionization, photodissociation, chemistry and winds in stellar environments. Thus it has an important…
Short-period stellar activity cycles with Kepler photometry
Oleksiy V. Arkhypov, Maxim L. Khodachenko, Helmut Lammer +3
We study the short-periodic component of stellar activity with a cycle periods Pcyc up to 1000 days using the Kepler mission photometry of fast-rotating (rotational periods from 1…
Helium signature in red giant oscillation patterns observed by Kepler
M. Vrard, B. Mosser, C. Barban +6
The space-borne missions CoRoT and Kepler have provided a large amount of precise photometric data. Among the stars observed, red giants show a rich oscillation pattern that allows…
Two-dimensional segmentation of small convective patterns in radiation hydrodynamics simulations
B. Lemmerer, D. Utz, A. Hanslmeier +4
Recent results from high-resolution solar granulation observations indicate the existence of a population of small granular cells that are smaller than 600 km in diameter. These sm…
Oxygen isotopic ratios in intermediate-mass red giants
Thomas Lebzelter, Oscar Straniero, Kenneth Hinkle +2
Context. The abundances of the three main isotopes of oxygen are altered in the course of the CNO-cycle. When the first dredge-up mixes the burning products to the surface, the nuc…
The Extreme Ultraviolet and X-Ray Sun in Time: High-Energy Evolutionary Tracks of a Solar-Like Star
Lin Tu, Colin P. Johnstone, Manuel Güdel +1
Aims. We aim to describe the pre-main sequence and main-sequence evolution of X-ray and extreme-ultaviolet radiation of a solar mass star based on its rotational evolution starting…