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32 papers · 2 filters
Magnetic geometry and surface differential rotation of the bright Am star Alhena A
Aurore Blazère, Pascal Petit, Coralie Neiner +5
Alhena A ( Gem A) is a bright Am star, with the strongest disc-integrated magnetic field strength reported so far for an Am star. Its spectrum exhibits standard circularly polar…
Probing the mid-layer structure of red giants I. Mixed-mode coupling factor as a seismic diagnosis
C. Pinçon, M. -J. Goupil, K. Belkacem
The space-borne missions CoRoT and Kepler have already brought stringent constraints on the internal structure of low-mass evolved stars, a large part of which results from the det…
Detection and characterisation of oscillating red giants: first results from the TESS satellite
Víctor Silva Aguirre, Dennis Stello, Amalie Stokholm +78
Since the onset of the `space revolution' of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archaeology in…
First discovery of trans-iron elements in a DAO-type white dwarf (BD)
L. Löbling, M. A. Maney, T. Rauch +4
We have identified 484 lines of the trans-iron elements (TIEs) Zn, Ga, Ge, Se, Br, Kr, Sr, Zr, Mo, In, Te, I, Xe, and Ba, for the first time in the ultraviolet spectrum of a DAO-ty…
Surprises in the simultaneous X-ray and optical monitoring of pi Aqr
Yael Naze, G. Rauw, M. Smith
To help constrain the origin of the peculiar X-ray emission of gamma Cas stars, we conducted a simultaneous optical and X-ray monitoring of pi Aqr in 2018. At that time, the star a…
Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
P. Eggenberger, G. Buldgen, S. J. A. J Salmon
Context: The internal rotation of the Sun constitutes a fundamental constraint when modelling angular momentum transport in stellar interiors. In addition to the more external regi…