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Asteroseismic measurement of surface-to-core rotation in a main-sequence star
- Source :
- EPJ Web of Conferences, Vol 101, p 01007 (2015)
- Publication Year :
- 2015
- Publisher :
- EDP Sciences, 2015.
-
Abstract
- 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 δ Sct p-mode pulsations and γ 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.
Details
- Language :
- English
- ISSN :
- 2100014X
- Volume :
- 101
- Database :
- Directory of Open Access Journals
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.87320c845dfd481eaa22038f9c0e8a99
- Document Type :
- article
- Full Text :
- https://doi.org/10.1051/epjconf/201510101007