CoRoT Symposium 3, Kepler KASC-7 joint meeting
6-11 Jul 2014 Toulouse (France)

Abstracts > Kurtz Donald

Tuesday 8
Session 1 - Probing stellar structure and evolution with asteroseismology
Dennis Stello (chair)
› 15:10 - 15:30 (20min)
Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
Donald Kurtz  1@  , Hideyuki Saio  2@  , Masao Takata  3@  , Hiromoto Shibahashi  3@  , Simon Murphy  4@  , Takashi Sekii  5@  
1 : University of Central Lancashire  (UCLan)
2 : Tohoku University [Sendai]  -  Website
Aramaki, Aoba 01, Sendai, Miyagi, 980-8579 -  Japan
3 : The University of Tokyo  -  Website
113-8654 Tokyo, Bunkyo -  Japan
4 : University of Sydney
5 : National Astronomical Observatory of Japan

We have discovered rotationally split core g-mode triplets and surface p-mode triplets and quintuplets in a terminal age main sequence A star, KIC 11145123, that shows both delta Sct p-mode pulsations and gamma Dor g-mode pulsations. This gives the first robust determination of the rotation of the deep core and surface of a main sequence star, essentially model-independently. We find its rotation to be nearly uniform with a period near 100d, but we show with high confidence that the surface rotates slightly faster than the core. A strong angular momentum transfer mechanism must be operating to produce the nearly rigid rotation, and a mechanism other than viscosity must be operating to produce a more rapidly rotating surface than core. Our asteroseismic result, along with previous asteroseismic constraints on internal rotation in some B stars, and measurements of internal rotation in some subgiant, giant and white dwarf stars, has made angular momentum transport in stars throughout their lifetimes an observational science. 

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