Minute-Cadence Observations of the LAMOST Fields with the TMTS: IV—Catalog of Cataclysmic Variables from the First 3-yr Survey

IF 2.5 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Universe Pub Date : 2024-08-23 DOI:10.3390/universe10090337

Qichun Liu, Jie Lin, Xiaofeng Wang, Zhibin Dai, Yongkang Sun, Gaobo Xi, Jun Mo, Jialian Liu, Shengyu Yan, Alexei V. Filippenko, Thomas G. Brink, Yi Yang, Kishore C. Patra, Yongzhi Cai, Zhihao Chen, Liyang Chen, Fangzhou Guo, Xiaojun Jiang, Gaici Li, Wenxiong Li, Weili Lin, Cheng Miao, Xiaoran Ma, Haowei Peng, Qiqi Xia, Danfeng Xiang, Jicheng Zhang

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引用次数: 0

Abstract

The Tsinghua University–Ma Huateng Telescopes for Survey (TMTS) started to monitor the LAMOST plates in 2020, leading to the discovery of numerous short-period eclipsing binaries, peculiar pulsators, flare stars, and other variable objects. Here, we present the uninterrupted light curves for a sample of 64 cataclysmic variables (CVs) observed/discovered using the TMTS during its first three-year observations, and we introduce new CVs and new light-variation periods (from known CVs) revealed through the TMTS observations. Thanks to the high-cadence observations of TMTS, diverse light variations, including superhumps, quasi-periodic oscillations, large-amplitude orbital modulations, and rotational modulations, are able to be detected in our CV samples, providing key observational clues for understanding the fast-developing physical processes in various CVs. All of these short-timescale light-curve features help further classify the subtypes of CV systems. We highlight the light-curve features observed in our CV sample and discuss further implications of minute-cadence light curves for CV identifications and classifications. Moreover, we examine the Hα emission lines in the spectra from our nonmagnetic CV samples (i.e., dwarf novae and nova-like subclasses) and find that the distribution of Hα emission strength shows significant differences between the sources with orbital periods above and below the period gap, which agrees with the trend seen from the SDSS nonmagnetic CV sample.

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利用 TMTS 对 LAMOST 星场进行的分钟级观测：IV-来自首次三年巡天的大灾变变星目录

清华大学-马化腾巡天望远镜（TMTS）于2020年开始监测LAMOST板块，发现了大量短周期食双星、奇特脉冲星、耀斑星和其他变星。在这里，我们展示了利用 TMTS 在第一个三年观测期间观测/发现的 64 个大灾变（CV）样本的不间断光变曲线，并介绍了通过 TMTS 观测发现的新 CV 和（已知 CV 的）新光变周期。得益于 TMTS 的高频率观测，我们能够在 CV 样本中探测到多种多样的光变，包括超跳、准周期振荡、大振幅轨道调制和旋转调制，为了解各种 CV 中快速发展的物理过程提供了关键的观测线索。所有这些短时标光曲线特征都有助于进一步划分 CV 系统的子类型。我们重点介绍了在我们的 CV 样本中观测到的光曲线特征，并讨论了分烛光光曲线对 CV 识别和分类的进一步影响。此外，我们还研究了非磁性CV样本（即矮新星和类新星子类）光谱中的Hα发射线，发现Hα发射强度的分布在轨道周期高于和低于周期差距的源之间存在显著差异，这与SDSS非磁性CV样本的趋势一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Universe Physics and Astronomy-General Physics and Astronomy

CiteScore

4.30

自引率

17.20%

发文量

562

审稿时长

24.38 days

期刊介绍： Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.