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标题：The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica
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作者：D. Mékarnia ; E. Chapellier ; T. Guillot 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：608
页码：1-4
DOI：10.1051/0004-6361/201732121
语种：English
出版社：EDP Sciences
摘要：Aims.The Antarctica Search for Transiting Extrasolar Planets (ASTEP), an automatized 400 mm telescope located at Concordia station in Antarctica, monitoredβPictoris continuously to detect any variability linked to the transit of the Hill sphere of its planetβPictoris b. The long observation sequence, from March to September 2017, combined with the quality and high level duty cycle of our data, enables us to detect and analyse theδScuti pulsations of the star.Methods.Time series photometric data were obtained using aperture photometry by telescope defocussing. The 66 418 data points were analysed using the software package Period04. We only selected frequencies with amplitudes that exceed four times the local noise level in the amplitude spectrum.Results.We detect 31δScuti pulsation frequencies, 28 of which are new detections. All the frequencies detected are in the interval 34.76−75.68 d-1. We also find thatβPictoris exhibits at least one pulsation mode that varies in amplitude over our monitoring duration of seven months.
关键词：enstars: individual: βPictorisstars: variables: δScutistars: oscillationsmethods: data analysistechniques: photometric