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We present optimized physical parameters of the active eclipsing binary system USNO-B1.0 1387-0467554 discovered recently in Yunnan–Hong Kong wide-field photometric (YNHK) survey, based on the analysis of its two colour light curves and low resolution spectra obtained at Yunnan Observatories, China. Its spot distributions are derived by means of the Wilson–Devinney code, using photometric data of the YNHK survey from 2016 to 2021. There exist active longitude belts for the spot activities on the primary star, for which the effect of tidal force seems dominant comparing with the one of common magnetic field of the binary system. We have investigated its chromospheric activities through the indicators including Hα, Hβ, CaII H&K, and HeI D3 lines covered by the low resolution spectroscopic observations. There are obvious spatial correlations between the magnetic activities in its photosphere and chromosphere. The EHα/EHβ values suggest that both plages and prominences led to the emissions seen in the Balmer lines at most phases. A prominence structure appeared around the phase of 0.8 on 2018 October 25 and evolved in November and December, 2018. The spectra demonstrate that there were frequent flare events in the system. Moreover, the decay part of a white-light flare event was hunted by the YNHK survey on 2021 October 26.

The lightcurves of asteroids are essential for determining their physical characteristics, including shape, spin, size, and surface composition. However, most asteroids are missing some of these basic physical parameters due to lack of photometric data. Although a few telescopes or surveys are specially designed for photometric lightcurve observations of asteroids, many ground-based and space-based sky surveys for hunting new exoplanets, transient events, etc., should capture numerous small Solar system objects. This will benefit the physical studies of these objects. In order to extract data of these moving objects from time-domain photometric surveys, we have developed a new method using the model tree algorithm in the field of machine learning. A dedicated module is built to automatically identify moving objects in data set and extract their photometric and astrometric data. As the first application of this novel method, we have analysed data in five fields of the Yunnan-Hong Kong wide field photometric (YNHK) survey, from which 538 lightcurves of 211 asteroids are successfully extracted. Meanwhile, we also tested the method based on the data from NASA’s Transiting Exoplanet Survey Satellite, and the result proves the reliability of our method. With derived lightcurves of 13 asteroids from the YNHK survey, we have determined their synodic spin periods, among which the periods of four asteroids are estimated for the first time. In future, we are going to apply this method to search for small objects in the outer part of the Solar system from the Chinese Space Station Telescope survey.

USNO-B1.0 1421-0485411 is an eclipsing binary system newly discovered in the Yunnan-Hong Kong wide-field photometric survey. Its orbital period is 1.295 days. Based on the V- and R-band photometric data collected at Kunming 1.0 m telescope and spectroscopic data observed at Lijiang 2.4 m telescope, we used the Wilson-Devinney program to determine the physical parameters of the binary system. The results show that the mass and radius are 2.21 M ⊙ and 1.70 R ⊙ for the A0V primary component, and 2.11 M ⊙ and 1.77 R ⊙ for the A4–5V secondary one. The observed light curves show higher shoulders around the secondary eclipse, which can originate from hot spots, circumstellar materials, abnormal albedo of the secondary component, etc. Through analyzing and modeling, a quite large albedo (∼1.89) of the secondary component was considered to be the most possible reason for this phenomenon. The position of the two components on the H-R diagram implies that the binary is in main-sequence stage.

A strong earthquake of M s 6.5 occurred on the margin of the Tibetan plateau in a rural area of Ludian county (Fig. 1a), northeastern Yunnan Province, China, at 16:30 (Beijing Standard Time) on 03 August 2014. The epicenter (103.3° E, 27.1° N) was located at the intersection of the northwest‐striking Baogunao–Xiaohe and northeast‐trending Zhaotong–Ludian faults (Fig. 1b). The focal mechanisms of the mainshock and four strong aftershocks (Fig. 2) showed that this was a high dip angle, sinistral strike‐slip event (http://www.eq-igl.ac.cn/wwwroot/c\_000000090001/d\_1406.html, last accessed August 2014; http://comcat.cr.usgs.gov/earthquakes/eventpage/usb000rzmg#scientific, last accessed September 2014; Fang et al. , 2014). As a result of this earthquake, 617 people died, 112 people were missing and presumed dead, 3143 people were injured, and many houses were damaged. Figure 1. (a) Southeastern margin of the Tibetan plateau. The white arrows show the Global Positioning System (GPS) velocity field of the Sichuan and Yunnan region with respect to the South China reference frame (modified from Zhang, 2013). ANHF, Anninghe fault; ZMHF, Zemuhe fault; DLSF, Daliangshan fault; and DBPF, Dien Bien Phu fault. The red stars (Fig. 1a–c) show the epicenter of the Ludian M s 6.5 earthquake. (b) The tectonic map of earthquake disaster areas (modified from http://www.eq-igl.ac.cn/wwwroot/c\_000000090001/d\_1406.html; last accessed August 2014); the dashed black rectangular box indicates the area of Figure 2. (c) The inset figure shows the Tibetan plateau and its adjacent area. ALTF, Altyn Tagh fault; HYF, Haiyuan fault; KLF, Kulun fault; GZYS, Ganzi–Yushu fault; LMSF, Longmenshan fault; RRF, Red River fault; and SAGF, Sagaing fault. The dashed white rectangular box indicates the area of Figure 1a. The dashed blue rectangular box indicates the area of Figure 1b. Figure 2. Distribution of landslides and precise relocation of the Ludian M s 6.5 earthquake sequences. The precise relocation …

Electric and magnetic screenings of thermal gluons are studied using the background expansion method in a gluodynamic model with a gauge invariant dimension-2 gluon condensate at zero momentum. At low temperature, the electric and magnetic gluons are degenerate. With the increase of temperature, it ...