Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123
By D. Kurtz, H. Saio, M. Takata, H. Shibahashi, S. Murphy, T. Sekii. 2014
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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 δ Sct pmode 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.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/d72da9a1265a2f7bef85d5dbe376c72b9c5e0e6a
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In Astronomy and Astrophysics
Citations in the corpus
- Slowing the spins of stellar cores (2019, background): “Hence, differential rotation can persist in slowly rotating stars, and this could explain why some very slowly rotating stars (see Kurtz et al. 2014; Saio et al. 2015; Triana et al. 2015; Kallinger et al. 2017; Sowicka et al. 2017) appear to exhibit some degree of differential rotation, while more…”