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UID:88@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260611T110000
DTEND;TZID=Europe/Paris:20260611T120000
DTSTAMP:20260618T122431Z
URL:https://osups.universite-paris-saclay.fr/calendrier/asteroseismology-f
 or-calibrating-physics-in-the-stellar-interior-a-case-study-2/
SUMMARY:Asteroseismology for calibrating physics in the stellar interior: a
  case study
DESCRIPTION:par Masao Takata (University of Tokyo)\n\nRésumé :\n\nAsteros
 eismology is a subfield of stellar astrophysics that aims to diagnose the 
 internal structure and dynamics of stars by measuring their oscillations a
 t the surface.  This area of study has recently seen significant developm
 ent thanks to space missions such as CoRoT\, Kepler and TESS.  This trend
  is set to accelerate further with the forthcoming PLATO mission.  Of the
  many successful examples\, I will discuss one particular object: KIC 9244
 992\, an F-type main-sequence star observed by the Kepler space telescope.
  This star exhibits two types of oscillation: short-period (high-frequency
 ) oscillations with the periods of a few hours and long-period (low-freque
 ncy) oscillations with the periods of about a day. This classification pla
 ces the star in the category of delta Sct–gamma Dor hybrid pulsators.  
 The most remarkable finding is that the rotational triplet structure has b
 een clearly detected in both frequency domains\, enabling us to constrain 
 the rotation structure in both the core and the envelope.  Furthermore\, 
 by carefully examining the fine structure (i.e. asymmetry) of the triplet 
 in the low-frequency domain\, we can successfully identify the signature o
 f the internal magnetic field and constrain its strength and geometry. We 
 discuss the possible origins of the field and the implications of these fi
 ndings.\n\n\nLieu : salle 1-2-3\, bât.121
CATEGORIES:Séminaires
LOCATION:IAS\, Bât. 121 rue Jean Teillac\, Orsay\, 91400\, France
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 , Orsay\, 91400\, France;X-APPLE-RADIUS=100;X-TITLE=IAS:geo:0,0
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DTSTART:20260329T030000
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