Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology
Article
Article Title | Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Hey, Daniel R. (Author), Holdsworth, Daniel L. (Author), Bedding, Timothy R. (Author), Murphy, Simon J. (Author), Cunha, Margarida S. (Author), Kurtz, Donald W. (Author), Huber, Daniel (Author), Fulton, Benjamin (Author) and Howard, Andrew W. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 488 (1), pp. 18-36 |
Number of Pages | 19 |
Year | 2019 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stz1633 |
Web Address (URL) | https://academic.oup.com/mnras/article/488/1/18/5518366 |
Abstract | We perform a search for rapidly oscillating Ap stars in the Kepler long-cadence data, where true oscillations above the Nyquist limit of 283.21 μHz can be reliably distinguished from aliases as a consequence of the barycentric time corrections applied to the Kepler data. We find evidence for rapid oscillations in six stars: KIC 6631188, KIC 7018170, KIC 10685175, KIC 11031749, KIC 11296437, and KIC 11409673, and identify each star as chemically peculiar through either pre-existing classifications or spectroscopic measurements. For each star, we identify the principal pulsation mode, and are able to observe several additional pulsation modes in KIC 7018170. We find that KIC 7018170 and KIC 11409673 both oscillate above their theoretical acoustic cut-off frequency, whilst KIC 11031749 oscillates at the cut-off frequency within uncertainty. All but KIC 11031749 exhibit strong amplitude modulation consistent with the oblique pulsator model, confirming their mode geometry and periods of rotation. |
Keywords | asteroseismology; techniques: photometric; stars: chemically peculiar; stars: oscillations; 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 ©: 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Sydney |
University of Central Lancashire, United Kingdom | |
University of Porto, Portugal | |
University of Hawaii, United States | |
National Aeronautics and Space Administration (NASA), United States | |
California Institute of Technology (Caltech), United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7386/six-new-rapidly-oscillating-ap-stars-in-the-kepler-long-cadence-data-using-super-nyquist-asteroseismology
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