Near-uniform internal rotation of the main-sequence γ Doradus pulsator KIC 7661054
Article
Article Title | Near-uniform internal rotation of the main-sequence γ Doradus pulsator KIC 7661054 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Murphy, Simon J. (Author), Fossati, Luca (Author), Bedding, Timothy R. (Author), Saio, Hideyuki (Author), Kurtz, Donald W. (Author), Grassitelli, Luca (Author) and Wang, Edric S. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 459 (2), pp. 1201-1212 |
Number of Pages | 12 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stw705 |
Web Address (URL) | https://academic.oup.com/mnras/article/459/2/1201/2595079 |
Abstract | We used Kepler photometry to determine the internal rotation rate of KIC 7661054, a chemically normal γ Dor star on the main sequence at spectral type F2.5 V. The core rotation period of 27.25 ± 0.06 d is obtained from the rotational splittings of a series of dipole g modes. The surface rotation period is calculated from a spectroscopic projected rotation velocity and a stellar radius computed from models. Literature data, obtained without inclusion of macroturbulence as a line-broadening mechanism, imply that the surface rotates much more quickly than the core, while our detailed analysis suggests that the surface may rotate slightly more quickly than the core and that the rotation profile is uniform within the 1σ uncertainties. We discuss the pitfalls associated with the determination of surface rotation rates of slow rotators from spectroscopy in the absence of asteroseismic constraints. A broad signal is observed at low frequency, which we show cannot be attributed to rotation, contrary to previous suggestions concerning the origin of such signals. |
Keywords | Asteroseismology; Stars: individual: KIC 7660154; Stars: oscillations; Stars: rotation; Techniques: spectroscopic |
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 ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Sydney |
Austrian Academy of Sciences, Austria | |
Tohoku University, Japan | |
University of Central Lancashire, United Kingdom | |
University of Bonn, Germany | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73q6/near-uniform-internal-rotation-of-the-main-sequence-doradus-pulsator-kic-7661054
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