Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123

作者：Kurtz Donald W^*; Saio Hideyuki; Takata Masao; Shibahashi Hiromoto; Murphy Simon J; Sekii Takashi

来源：Monthly Notices of the Royal Astronomical Society, 2014, 444(1): 102-116.

DOI：10.1093/mnras/stu1329

• asteroseismology
• stars: individual: KIC 11145123
• stars: interiors
• stars: oscillations
• stars: rotation
• stars: variables: delta Scuti

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 100 d, 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.

• 出版日期2014-10-11
• 单位中国科学院国家天文台