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TESS Cycle 2 Observations of Roap Stars with 2-Min Cadence Data

D. L. Holdsworth,M. S. Cunha W. Zong,S. Seager

Monthly Notices of the Royal Astronomical Society(2024)SCI 2区

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Abstract
We present the results of a systematic search of the Transiting Exoplanet Survey Satellite (TESS) 2-min cadence data for new rapidly oscillating Ap (roAp) stars observed during the Cycle 2 phase of its mission. We find seven new roAp stars previously unreported as such and present the analysis of a further 25 roAp stars that are already known. Three of the new stars show multiperiodic pulsations, while all new members are rotationally variable stars, leading to almost 70 per cent (22) of the roAp stars presented being alpha(2) CVn-type variable stars. We show that targeted observations of known chemically peculiar stars are likely to overlook many new roAp stars, and demonstrate that multiepoch observations are necessary to see pulsational behaviour changes. We find a lack of roAp stars close to the blue edge of the theoretical roAp instability strip, and reaffirm that mode instability is observed more frequently with precise, space-based observations. In addition to the Cycle 2 observations, we analyse TESS data for all-known roAp stars. This amounts to 18 further roAp stars observed by TESS. Finally, we list six known roAp stars that TESS is yet to observe. We deduce that the incidence of roAp stars amongst the Ap star population is just 5.5 per cent, raising fundamental questions about the conditions required to excite pulsations in Ap stars. This work, coupled with our previous work on roAp stars in Cycle 1 observations, presents the most comprehensive, homogeneous study of the roAp stars in the TESS nominal mission, with a collection of 112 confirmed roAp stars in total.
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asteroseismology,techniques: photometric,stars: chemically peculiar,stars: oscillations,stars: variables stars: individual
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要点】:本文通过分析TESS卫星Cycle 2阶段2分钟采样频率的数据,发现了7颗新的快速振荡Ap型星(roAp),并对已知的25颗roAp星进行了分析,揭示了roAp星在Ap星中的比例为5.5%,并提出对激发Ap星振荡条件的疑问。

方法】:作者通过系统地搜索TESS卫星的2分钟采样数据,对数据中的周期性变化进行分析,识别出roAp星,并利用多时段观测来观察脉冲行为的改变。

实验】:本文使用了TESS Cycle 2的2分钟采样数据,对已知的全部roAp星进行了分析,共确认了112颗roAp星,其中包括新发现的7颗roAp星,以及18颗之前已知的roAp星。实验结果揭示了roAp星在理论不稳定带蓝端附近的缺乏,并通过精确的空间观测更频繁地观察到模式不稳定性。