Subjects: Astronomy submitted time 2025-07-02 Cooperative journals: 《天文学进展》
Abstract： High-amplitude δ scuti stars (HADS), a subclass of δ Scuti pulsating variable stars, are characterized by short pulsation periods, large amplitudes, and single or multiple radial pulsation modes, making them an important target for asteroseismology. In this paper, a frequency analysis of three HADS is performed for the first time using the time-series photometry data provided by the Transiting Exoplanet Survey Satellite (TESS). The result show that TIC 355547586 pulsates at the fundamental frequency and first overtone, and TIC 358502706 at the fundamental frequency, first and third overtone. Non-radial pulsation frequencies were also detected in their frequency spectra. TIC 260654645 is pulsating at fundamental frequency and first overtone. The phase-folding curve of the source has a clear bulge in the brightness-decreasing phase near the luminosity minima, exhibiting the characteristics of a ab-type RR Lyrae, and the period ratio of the first overtone to the fundamental frequency of it is larger than the theoretical prediction for radial pulsation, which, combined with its positional deviation from the HADS pulsation instability band on the Hertzsprung-Russell diagram, makes the star worthy of further study.
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-17 Cooperative journals: 《天文研究与技术》
Abstract： 对新疆天文台(XAO)南山一米大视场天文望远镜（NOWT）观测的历史数据，我们进行细致的数据挖掘，发现了百余颗变源。数据处理pipeline为XAO时域巡天数据处理包，该处理包同时考虑了测光系统内部权重和相关性，并结合快速混合算法编写的。除去已知的变源，我们发现了很多新的变源。对新变源证认的过程中，我们将结果与LAMOST、GCVS、VSX、Gaia DR2等星表进行了交叉。在讨论部分，我们对各星表的使用情况给出了说明。对于新源最后发现绝大部分是食双星，少部分是脉动变星，并有一颗表现相对复杂的变源。
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