Asteroseismic measurement of surface-to-core rotation in a main-sequence star

Kurtz, Donald Wayne orcid iconORCID: 0000-0002-1015-3268, Saio, Hideyuki, Takata, Masao, Shibahashi, Hiromoto, Murphy, Simon J. and Sekii, Takashi (2015) Asteroseismic measurement of surface-to-core rotation in a main-sequence star. EPJ Web of Conferences, 101 . 01007. ISSN 2100-014X

[thumbnail of Version of Record - Open Access]
PDF (Version of Record - Open Access) - Published Version
Available under License Creative Commons Attribution.


Official URL:


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.

Repository Staff Only: item control page