Asteroseismic measurement of slow, nearly uniform surface-to-core rotation in the main-sequence F star KIC 9244992
Article
Article Title | Asteroseismic measurement of slow, nearly uniform surface-to-core rotation in the main-sequence F star KIC 9244992 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Saio, Hideyuki (Author), Kurtz, Donald W. (Author), Takata, Masao (Author), Shibahashi, Hiromoto (Author), Murphy, Simon J. (Author), Sekii, Takashi (Author) and Bedding, Timothy R. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 447 (4), pp. 3264-3277 |
Number of Pages | 14 |
Year | 2015 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stu2696 |
Web Address (URL) | https://academic.oup.com/mnras/article/447/4/3264/1750474 |
Abstract | We have found a rotationally split series of core g-mode triplets and surface p-mode multiplets in a main-sequence F star, KIC 9244992. Comparison with models shows that the star has a mass of about 1.45 M⊙, and is at an advanced stage of main-sequence evolution in which the central hydrogen abundance mass fraction is reduced to about 0.1. This is the second case, following KIC 11145123, of an asteroseismic determination of the rotation of the deep core and surface of an A-F main-sequence star. We have found, essentially model independently, that the rotation near the surface, obtained from p-mode splittings, is 66 d, slightly slower than the rotation of 64 d in the core, measured by g-mode splittings. KIC 9244992 is similar to KIC 11145123 in that both are near the end of main-sequence stage with very slow and nearly uniform rotation. This indicates the angular momentum transport in the interior of an A-F star during the main-sequence stage is much stronger than that expected from standard theoretical formulations. |
Keywords | Asteroseismology; Stars: individual: KIC 9244992; Stars: interiors; Stars: oscillations; Stars: rotation; 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 ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Tohoku University, Japan |
University of Central Lancashire, United Kingdom | |
University of Tokyo, Japan | |
University of Sydney | |
National Astronomical Observatory of Japan, Japan | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73vx/asteroseismic-measurement-of-slow-nearly-uniform-surface-to-core-rotation-in-the-main-sequence-f-star-kic-9244992
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