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Large amplitude change in spot-induced rotational modulation of the Kepler Ap star KIC 2569073

Drury, J. S. and Murphy, S. J. and Derekas, Aliz and Sódor, Ádám and Stello, S. and Sódorné Bognár, Zsófia and Szigeti, László and Szakáts, Róbert and Sárneczky, Krisztián and Molnár, László (2017) Large amplitude change in spot-induced rotational modulation of the Kepler Ap star KIC 2569073. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 471 (3). pp. 3193-3199. ISSN 0035-8711

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Abstract

An investigation of the 200 x 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 alpha(2) 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.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 25 May 2023 11:36
Last Modified: 25 May 2023 11:36
URI: http://real.mtak.hu/id/eprint/166094

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