Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 444, Issue 1, Pages 102-116Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1329
Keywords
asteroseismology; stars: individual: KIC 11145123; stars: interiors; stars: oscillations; stars: rotation; stars: variables: delta Scuti
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Funding
- JSPS Japan-UK Joint Research grant
- JSPS
- Science and Technology Facilities Council [ST/J001341/1] Funding Source: researchfish
- STFC [ST/J001341/1] Funding Source: UKRI
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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.
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