| Autor: |
Lin, Jie, Wang, Xiaofeng, Mo, Jun, Xi, Gaobo, Filippenko, Alexei V, Yan, Shengyu, Brink, Thomas G, Yang, Yi, Wu, Chengyuan, Németh, Péter, Li, Gaici, Guo, Fangzhou, Guo, Jincheng, Cai, Yongzhi, Xiong, Heran, Zheng, WeiKang, Liu, Qichun, Zhang, Jicheng, Jiang, Xiaojun, Chen, Liyang |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; Aug2023, Vol. 523 Issue 2, p2172-2192, 21p |
| Abstrakt: |
Over the past few years, wide-field time-domain surveys such as Zwicky Transient Facility and Optical Gravitational Lensing Experiment have led to discoveries of various types of interesting short-period stellar variables, such as ultracompact eclipsing binary white dwarfs (WDs), rapidly rotating magnetized WDs, transitional cataclysmic variables between hydrogen-rich and helium accretion, and blue large-amplitude pulsators (BLAPs), which greatly enrich our understandings of stellar physics under some extreme conditions. In this paper, we report the first-2-yr discoveries of short-period variables (i.e. P < 2 h) by the Tsinghua University–Ma Huateng Telescopes for Survey (TMTS). TMTS is a multitube telescope system with a field of view up to 18 deg2, which started to monitor the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) sky areas since 2020 and generated uninterrupted minute-cadence light curves for about 10 million sources within 2 yr. Adopting the Lomb–Scargle periodogram with period-dependent thresholds for the maximum powers, we identify over 1100 sources that exhibit a variation period shorter than 2 h. Compiling the light curves with the Gaia magnitudes and colours, LAMOST spectral parameters, International Variable Star Index classifications, and archived observations from other prevailing time-domain survey missions, we identified 1076 as δ Scuti stars, which allows us to study their populations and physical properties in the short-period regime. The other 31 sources include BLAPs, subdwarf B variables, pulsating WDs, ultracompact/short-period eclipsing/ellipsoidal binaries, cataclysmic variables below the period gap, etc. which are highly interesting and worthy of follow-up investigations. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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