Zobrazeno 1 - 10
of 216
pro vyhledávání: '"Ligniéres, F."'
Publikováno v:
A&A 670, L16 (2023)
Despite their importance in stellar evolution, little is known about magnetic fields in the interior of stars. The recent seismic detection of magnetic fields in the core of several red giant stars has given measurements of their strength and informa
Externí odkaz:
http://arxiv.org/abs/2301.01308
Publikováno v:
A&A 666, A20 (2022)
Aims. The very weak magnetic field detected at the surface of Vega hints at a widespread population of weakly magnetic stars of A and B spectral types. We contribute here to gather more clues about the origin of this magnetism by investigating the lo
Externí odkaz:
http://arxiv.org/abs/2208.09196
Publikováno v:
A&A 661, A119 (2022)
Some contracting or expanding stars are thought to host a large-scale magnetic field in their radiative interior. By interacting with the contraction-induced flows, such fields may significantly alter the rotational history of the star. They thus con
Externí odkaz:
http://arxiv.org/abs/2201.02645
Publikováno v:
A&A 648, A109 (2021)
Context. Stars experience rapid contraction or expansion at different phases of their evolution. Modelling the angular momentum and chemical elements transport occurring during these phases remains an unsolved problem. Aims. We study a stellar radiat
Externí odkaz:
http://arxiv.org/abs/2011.08884
Autor:
Ouazzani, R-M., Lignières, F., Dupret, M-A., Salmon, S. J. A. J., Ballot, J., Christophe, S., Takata, M.
Publikováno v:
A&A 640, A49 (2020)
Gamma Doradus stars present an incredibly rich pulsation spectra, with gravito-inertial modes, in some cases supplemented with delta Scuti-like pressure modes and in numerous cases with Rossby modes. The present paper aims at showing that, in additio
Externí odkaz:
http://arxiv.org/abs/2006.09404
Publikováno v:
A&A 641, A13 (2020)
The present study aims at studying the flow and field produced by a stellar radiative zone which is initially made to rotate differentially in the presence of a large-scale poloidal magnetic field threading the whole domain. We focus both on the axis
Externí odkaz:
http://arxiv.org/abs/2006.08230
Autor:
Lignières, F.
The topic of turbulent transport in a stellar radiative zone is vast and poorly understood. Many physical processes can potentially drive turbulence in stellar radiative zone but the limited observational constraints and the uncertainties in modellin
Externí odkaz:
http://arxiv.org/abs/1911.07813
Stably stratified layers are present in stellar interiors (radiative zones) as well as planetary interiors - recent observations and theoretical studies of the Earth's magnetic field seem to indicate the presence of a thin, stably stratified layer at
Externí odkaz:
http://arxiv.org/abs/1910.04092
Spectral signatures of surface spots were recently discovered from high cadence observations of the A star Vega. We aim at constraining the surface distribution of these photospheric inhomogeneities, and investigating a possible short term evolution
Externí odkaz:
http://arxiv.org/abs/1708.04548
Autor:
Reese, D. R., Lignières, F., Ballot, J., Dupret, M. -A., Barban, C., Veer-Menneret, C. van 't, MacGregor, K. B.
Publikováno v:
A&A 601, A130 (2017)
Context: Mode identification has remained a major obstacle in the interpretation of pulsation spectra in rapidly rotating stars. Aims: We would like to test mode identification methods and seismic diagnostics in rapidly rotating stars, using oscillat
Externí odkaz:
http://arxiv.org/abs/1701.09164