Large amplitude change in spot-induced rotational modulation of the Kepler Ap star KIC 2569073
Article
Article Title | Large amplitude change in spot-induced rotational modulation of the Kepler Ap star KIC 2569073 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Drury, Jason A. (Author), Murphy, Simon J. (Author), Derekas, Aliz (Author), Sodor, Adam (Author), Stello, Dennis (Author), Kuehn, Charles A. (Author), Bedding, Timothy R. (Author), Bognar, Zsofia (Author), Szigeti, Laszlo (Author), Szakats, Robert (Author), Sarneczky, Krisztian (Author) and Molnar, Laszlo (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 471 (3), pp. 3193-3199 |
Number of Pages | 7 |
Year | 2017 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stx1722 |
Web Address (URL) | https://academic.oup.com/mnras/article/471/3/3193/3964534 |
Abstract | An investigation of the 200 × 200 pixel ‘superstamp’ images of the centres of the open clusters NGC 6791 and NGC 6819 allows for the identification and study of many variable stars that were not included in the Kepler target list. KIC 2569073 (V = 14.22), is a particularly interesting variable Ap star that we discovered in the NGC 6791 superstamp. With a rotational period of 14.67 d and 0.034 mag variability, it has one of the largest peak-to-peak variations of any known Ap star. Colour photometry reveals an antiphase correlation between the B band, and the V, R and I bands. This Ap star is a rotational variable, also known as an α2 CVn star, and is one of only a handful of Ap stars observed by Kepler. While no change in spot period or amplitude is observed within the 4 yr Kepler time series, the amplitude shows a large increase compared to ground-based photometry obtained two decades ago. |
Keywords | Stars: chemically peculiar; Stars: individual: KIC 2569073; Stars: rotation; Starspots; Techniques: photometric; 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 ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Sydney |
ELTE Gothard Astrophysical Observatory, Hungary | |
Konkoly Observatory, Hungary |
https://research.usq.edu.au/item/q737w/large-amplitude-change-in-spot-induced-rotational-modulation-of-the-kepler-ap-star-kic-2569073
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