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

Donald W. Kurtz, Hideyuki Saio, Masao Takata, Hiromoto Shibahashi, Simon J. Murphy, Takashi Sekii

Research output: Contribution to journalArticlepeer-review

112 Citations (Scopus)

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 d Sct pmode pulsations and λ 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.

Original languageEnglish
Pages (from-to)102-116
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume444
Issue number1
DOIs
Publication statusPublished - 2014 Jul 26

Keywords

  • Asteroseismology
  • Stars: individual: KIC 11145123
  • Stars: interiors
  • Stars: oscillations
  • Stars: rotation
  • Stars: variables: δ Scuti

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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