111 citations · 499 across the 24 of their papers we have counts for
24 papers
Spectroscopic and Decade-long Photometric Observations of the Contact Binary V2790 Ori: Evidence for a Brown Dwarf Companion and a Solar-like Magnetic Activity Cycle
Si-Rui Wang, Kai Li, Qi-Qi Xia +6
We present 22 sets of light curves and one radial velocity curve for the W UMa-type total eclipse contact binary system V2790 Ori, derived by combining all available public photome…
Optical Flares Detected on a Contact Binary: The First Photometric and Spectroscopic Analysis of a Long-period Low Mass Ratio Contact Binary HAT 307-0007476
Ling-Zhi Li, Kai Li, Xiang Gao +10
This paper presents the photometric and spectroscopic analysis of a long-period totally eclipsing contact binary (HAT 307-0007476) for the first time. This system is a low mass rat…
Search for and analysis of eclipsing binaries in the LAMOST Medium-Resolution Survey field. I. RA: , Dec: +343645
Jing-Yi Wang, Kai Li, Xiang Gao +7
Eclipsing binaries (EBs) play an important astrophysical role in studying stellar properties and evolution. By analyzing photometric data in the LAMOST Medium-Resolution Survey fie…
Detection of the lowest mass ratio contact binary in the universe: TYC 3801-1529-1
Kai Li, Xiang Gao, Di-Fu Guo +7
This paper presents the first analysis of the contact binary TYC 3801-1529-1. We observed four sets of multiple bands complete light curves and one set of radial velocity curve of…
Prominence detection and chromosphere feature on the prototype RS CVn of active binary systems
Dongtao Cao, Shenghong Gu, U. Wolter +4
We present a study of high-resolution spectra of RS Canum Venaticorum (RS CVn), a prototype of active binary systems. Our data were obtained from 1998 to 2017 using different teles…
Fine structures of radio bursts from flare star AD Leo with FAST observations
Jiale Zhang, Hui Tian, Philippe Zarka +8
Radio bursts from nearby active M-dwarfs have been frequently reported and extensively studied in solar or planetary paradigms. Whereas, their sub-structures or fine structures rem…
Correcting Stellar Flare Frequency Distributions Detected by TESS and Kepler
Dong-Yang Gao, Hui-Gen Liu, Ming Yang +1
The habitability of planets is closely connected with the stellar activity, mainly the frequency of flares and the distribution of flare energy. Kepler and TESS find many flaring s…
The First Photometric and Orbital Period Investigation of an Extremely Low Mass Ratio Contact Binary with a Sudden Period Change, TYC 4002-2628-1
Di-Fu. Guo, Kai Li, 1 Fen Liu +6
Photometric observations for the totally eclipsing binary system TYC 4002-2628-1, were obtained between November 2020 and November 2021. To determine the stellar atmospheric parame…
Two contact binaries with mass ratios close to the minimum mass ratio
Kai Li, Qi-Qi Xia, Chun-Hwey Kim +5
The cut-off mass ratio is under debate for contact binaries. In this paper, we present the investigation of two contact binaries with mass ratios close to the low mass ratio limit.…
Spectroscopic evidence for a large spot on the dimming Betelgeuse
Sofya Alexeeva, Gang Zhao, Dong-Yang Gao +4
During October 2019 and March 2020, the luminous red supergiant Betelgeuse demonstrated an unusually deep minimum of its brightness. It became fainter by more than one magnitude an…
A possible tidal disruption event candidate in the black hole binary system of OJ 287
Shifeng Huang, Shaoming Hu, Hongxing Yin +4
The BL Lacertae OJ 287 is a supermassive black holes binary (SMBHB) system with complex physics of its irregular flares. During 2016 October -- 2017 April period, a surprising outb…
Photometric study and absolute parameters estimation of six totally eclipsing contact binaries
Kai Li, Qi-Qi Xia, Chun-Hwey Kim +6
High precision CCD observations of six totally eclipsing contact binaries were presented and analyzed. It is found that only one target is an A-type contact binary (V429 Cam), whil…
Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
Kai Li, Qi-Qi Xia, Raul Michel +5
The period distribution of contact binaries exhibits a very sharp short period cut-off at 0.22 days. In order to provide valuable information on this short period limit, we observe…
A possible giant planet orbiting the cataclysmic variable LX Ser
K. Li, S. -M. Hu, J. -L. Zhou +6
LX Ser is a deeply eclipsing cataclysmic variable with an orbital period of . Sixty two new eclipse times were determined by our observations and the AAVSO Internatio…
WES - Weihai Echelle Spectrograph
Dong-Yang Gao, Hang-Xin Ji, Chen Cao +7
The Weihai Echelle Spectrograph (WES) is the first fiber-fed echelle spectrograph for astronomical observation in China. It is primarily used for chemical abundance and asteroseism…
The Night Sky Spectrum of Xinglong Observatory: Changes from 2004 to 2015
Ji-Cheng Zhang, Zhou Fan, Jing-Zhi Yan +4
We present spectroscopic measurements on the night sky of Xinglong Observatory for a period of 12 years from 2004 to 2015. The spectra were obtained on moonless clear nights using…
The active W UMa type binary star V781 Tau revisited
Kai Li, Dongyang Gao, Shaoming Hu +3
In this paper, new determined BVR_cI_c light curves and radial velocities of V781 Tau are presented. By analyzing the light curves and radial velocities simultaneously, we found th…
The Weihai Observatory search for close-in planets orbiting giant stars
Robert A. Wittenmyer, Dongyang Gao, Shao Ming Hu +3
Planets are known to orbit giant stars, yet there is a shortage of planets orbiting within ~0.5 AU (P<100 days). First-ascent giants have not expanded enough to engulf such planets…
Discovery of a deep, low mass ratio overcontact binary GSC 03517-00663
D. -F. Guo, K. Li, S. -M. Hu +3
When observing the blazars, we identified a new eclipsing binary GSC 03517-00663. The light curves of GSC 03517-00663 are typical EW-type light curves. Based on the observation usi…
The first photometric analysis of the near contact binary IR Cas
K. Li, S. -M. Hu, D. -F. Guo +3
The first photometric analysis of IR Cas was carried out based on the new observed BVRI light curves. The symmetric light curves and nearly flat secondary minimum indicate that ver…
Discovery of a W UMa type binary GSC 03553-00845
D. -F. Guo, K. Li, S. -M. Hu +3
When observing the transiting extrasolar planets, we discovered a new W UMa type binary GSC 03553-00845. Following observation was carried out using the 1m telescope at Weihai Obse…
Sky Brightness at Weihai Observatory of Shandong University
Di-Fu Guo, Shao-Ming Hu, Xu Chen +2
In this paper, a total of about 28000 images in and band obtained on 161 nights using the one-meter optical telescope at Weihai Observatory (WHO) of Shandong University sin…
Multiwavelength study of nearly face-on low surface brightness disk galaxies
Dong Gao, Yan-Chun Liang, Shun-Fang Liu +7
We study the ages of a large sample (1,802) of nearly face-on disk low surface brightness galaxies (LSBGs) by using the evolutionary population synthesis (EPS) model PEGASE with ex…
The properties of a large sample of low surface brightness galaxies from SDSS
Y. C. Liang, G. H. Zhong, X. Y. Chen +6
A large sample of low surface brightness (LSB) disk galaxies is selected from SDSS with B-band central surface brightness mu_0(B) from 22 to 24.5 mag arcsec^(-2). Some of their pro…