ANR IMAGINE

Meetings

Tuesday, 29 May

9:30 - 10:00 Welcome at Paris-Meudon Observatory (see the observatory access)

09:30 -12:30

• Aurore Blazère : Search for magnetic Am stars: latest news

• Pascal Petit : Differential rotation in weakly magnetic stars

• François Lignières : Differential rotation and meridional circulation in contracting radiative zone

• Rea Dalipi : The magnetic field of the B3 star i Car

• Kevin Villaret : The magnetic field of the chemically peculiar B8 star alpha Dor

12:30 - 14:00 Lunch time

14:00 - 17:00

• Stéphane Mathis : The interplay between tidal and electromagnetic interactions in magnetic massive binaries: understanding spins and magnetic fields orientation

• Asif Ud-Doula : Disruption of circumstellar discs by large-scale stellar magnetic field

• Bram Buysschaert : Observing the interior of a magnetic star using asteroseismology

• Konstanze Zwintz : The magnetic delta Scuti star beta Cas (remotely)

• Discussion on future observations

Monday, 27 February

9:30 - 10:00 Welcome at the meeting room "Salle Lyot" in Midi-Pyrénées Observatory (see the observatory access)

10:00 -12:30 Massive and intermediate-mass star magnetism

• Long term variation of Vega magnetic fields - Aurore Blazère

• The magnetic desert revisited in the light of a survey of nearby Ap/Bp stars and Kepler observations of common micro-variability of main sequence A stars - Gregg Wade & James Sikora

• Ap/Bp descendants : new candidates - Pascal Petit

• Alhena : an Am or an evolved Ap star ? - Aurore Blazère

12:30 - 14:00 Lunch time

14:00 - 17:00 Massive and intermediate-mass star magnetism

• The asymmetric Stokes V profiles of Sirius & Co - Discussion animated by Colin Folsom and Arturo Lopez-Ariste

• The magnetic field of evolved hot stars - Coralie Neiner

• Magnetic delta Scuti stars: a new class of magnetic stars - Coralie Neiner

• Observational constraint on rotatonal mixing - Fabrice Martins

• Discussion on future observations

Tuesday, 28th February :

10:00 - 12:30 Stability and dynamos in stellar radiative zones

• MHD instabilities in rapidly rotating systems - Ludovic Petitdemange

• Unstable versus stable magnetic fields in differentially rotating stars - Laurène Jouve

• Magnetic spherical Couette flows - Domenico Meduri

• Stably stratified spherical Couette flows - Francois Lignières

12:30 - 14:00 Lunch time

14:00 - 16:00 Stability and dynamos in stellar radiative zones

• Examining the stability of non-axisymmetric magnetic fields in stellar radiative zones - Kyle Augustson

• Dynamos triggered by tides in stratified layers - Nathanaël Schaeffer & Jérémie Vidal

• Inertial and magneto-Coriolis modes in the spherical Couette flow - Ankit Barik

• Discussions over future simulations/models

Thursday, 1st October

11:00 - 11:30 Welcome at the meeting room of building #17 in Meudon Observatory (see the observatory map)

11:30 -12:50 Massive and intermediate-mass star magnetism

• Spots spotted on Vega - Torsten Böhm

• Ultra-weak magnetic fields in Am stars - Aurore Blazère & Pascal Petit

13:00 - 14:00 Lunch

14:00 - 18:00 Massive and intermediate-mass star magnetism

• A first attempt towards modelling ultra-weak asymmetric Stokes V profiles - Colin Folsom

• Search for Vega-like magnetism in B stars - Aurore Blazère & Coralie Neiner

• On the presence/absence of magnetic deserts in massive stars - Lucas Fossati

• Binamics : first results on hot stars - Evelyne Alecian

• Search for descendant of Ap stars - Jérôme Ballot

• Discussions over future observations

Friday, 2nd October :

10:00 - 13:00 Stability of large scale magnetic field configurations

• The formation and relaxation of fossil magnetic fields in rotating stars - Stéphane Mathis & Constance Emeriau

• Stability of magnetic fields in differentially rotating stars - from 2D numerical simulations - Mathieu Gaurat

• Stability of magnetic fields in differentially rotating stars - from 3D numerical simulations - Laurène Jouve

• Discussions over future simulations/models

13:00 - 14:00 Lunch

14:00- 15:30 Conclusions on future observations and simulations/models

09:30 - 11:00 Etoiles Massives

• Results of the MiMeS survey - Gregg Wade

• Le champ magnétique de l'étoile massive zeta Ori A - Aurore Blazère

• Recherche d'un champ magnétique de type Vega dans l'étoile B gamma Peg - Coralie Neiner
Search for a Vega-like magnetic field on the B star Iota Her - Gregg Wade

• Discussion: Stratégies de recherche des champs de type Vega dans les étoiles OB - Coralie Neiner

11:30 - 11:30 Etoiles de masse-intermédiaire

• Propriétes des étoiles Am versus celles des A "normales" - Richard Monier

• Vega-like : résultats et stratégie - Pascal Petit

• Le champ inférieur des Ap/Bp - François Lignières

14:00 - 15:00 Stabilité des champs dipolaires dans une étoile en rotation différentielle

• Evolution du champ toroidal dans le cas axisymétrique - Mathieu Gaurat

• Stabilité et instabilité dans le cas 3D - Laurène Jouve

15:00 - 16:00 Discussion sur les actions à mener