Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123
Article
Article Title | Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Kurtz, Donald W. (Author), Saio, Hideyuki (Author), Takata, Masao (Author), Shibahashi, Hiromoto (Author), Murphy, Simon J. (Author) and Sekii, Takashi (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 444 (1), pp. 102-116 |
Number of Pages | 15 |
Year | 2014 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stu1329 |
Web Address (URL) | https://academic.oup.com/mnras/article/444/1/102/1009186 |
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. |
Keywords | Asteroseismology; Stars: individual: KIC 11145123; Stars: interiors; Stars: oscillations; Stars: rotation; Stars: variables: δ Scuti; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Central Lancashire, United Kingdom |
Tohoku University, Japan | |
University of Tokyo, Japan | |
National Astronomical Observatory of Japan, Japan | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7390/asteroseismic-measurement-of-surface-to-core-rotation-in-a-main-sequence-a-star-kic-11145123
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