SIMBAD references

2017MNRAS.471.3193D - Mon. Not. R. Astron. Soc., 471, 3193-3199 (2017/November-1)

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

DRURY J.A., MURPHY S.J., DEREKAS A., SODOR A., STELLO D., KUEHN C.A., BEDDING T.R., BOGNAR Z., SZIGETI L., SZAKATS R., SARNECZKY K. and MOLNAR L.

Abstract (from CDS):

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 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.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - stars: chemically peculiar - stars: individual: KIC 2569073 - stars: rotation - starspots - starspots

Simbad objects: 8

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2023.02.08-21:57:33

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