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Absolute parameters of the three totally-eclipsing WUMa stars NSVS 2443858, NSVS 780649 and V1098 Her
Popov, Velimir; Acerbi, Francesco; Barani, Carlo
We present the first photometric analysis of three totally-eclipsing W UMa binaries, NSVS 2443858, NSVS 780649 and V1098 Her. The absolute astrophysical parameters of the stellar components were determined by means of Gaia distances and light curve solutions. The results show that: (i) Two of the systems, NSVS 2443858 and V1098 Her, are of A subty…
Predicting the CME arrival time based on the recommendation algorithm
Luo, Bingxian; Liu, Zhu; Li, Ming +9 more
CME is one of the important events in the sun-earth system as it can induce geomagnetic disturbance and an associated space environment effect. It is of special significance to predict whether CME will reach the Earth and when it will arrive. In this paper, we firstly built a new multiple association list for 215 different events with 18 character…
The fractions of post-binary-interaction stars and evolved blue straggler stars on the red giant branch of globular clusters
Wang, Hai-Feng; Jiang, Deng-Kai; Wang, Bo +4 more
The red giant branch (RGB) of globular clusters (GCs) is home to some exotic stars, which may provide clues on the formation of multiple stellar populations in GCs. It is well known that binary interactions are responsible for many exotic stars. Thus, it is important to understand what fraction of stars on the RGB of GCs is the result of binary in…
Symmetry properties and widths of the filamentary structures in the Orion A giant molecular cloud
Zheng, Yu-Qing; Wang, Hong-Chi; Ma, Yue-Hui +1 more
We identify 225 filaments from an H2 column density map constructed using simultaneous 12CO, 13CO and C18O (J = 1-0) observations carried out as a part of the Milky Way Imaging Scroll Painting (MWISP) project.We select 46 long filaments with lengths above 1.2 pc to analyze the filament column density pro…
The first photometric analysis and period investigation of the K-type W UMa type binary system V0842 Cep
Li, Kai; Liu, Yuan; Li, Yu-Yang
V0842 Cep is a W UMa-type binary star that has been neglected since its discovery. We analysed the VRcIc light curves, obtained by the 1 m telescope at Weihai Observatory of Shandong University, using the Wilson-Devinney code. V0842 Cep was found to be a shallow contact binary system (f = 8.7%) with a mass ratio of 2.281. Bec…
High-α-Metal-Rich stars in the LAMOST-MRS survey and its connection with the galactic bulge
Zhao, Gang; Zhao, Jing-Kun; Wang, Rui +6 more
We report the detection of a large sample of high-α-metal-rich stars on the low giant branch with 2.6 < log g < 3.3 dex in the LAMOST-MRS survey. This special group corresponds to an intermediate-age population of 5 - 9 Gyr based on the [Fe/H]-[C/N] diagram and age-[C/N] calibration. A comparison group is selected to have a solar α ratio at …
FUV and NIR size of the HI selected low surface brightness galaxies
Cheng, Cheng; Li, Zi-Jian; Huang, Jia-Sheng +10 more
How low surface brightness galaxies (LSBGs) form stars and assemble stellar mass is one of the most important questions related to understanding the LSBG population. We select a sample of 381 HI bright LSBGs with both far ultraviolet (FUV) and near infrared (NIR) observations to investigate the star formation rate (SFR) and stellar mass scales, an…
Investigating variable stars in the open cluster NGC 1912 and its surrounding field
Zhang, Yu; Esamdin, Ali; Chen, Li +6 more
In this work, we studied the variable stars in the open cluster NGC 1912 based on the photometric observations and Gaia DR2 data. More than 3600 CCD frames in B, V, R filters were reduced, and we obtained the light curves that span about 63 hours. By analyzing these light curves, we detected 24 variable stars, including 16 periodic variable stars,…
Does ADS 9346 have a low-mass companion?
Kiyaeva, Olga V.; Khovritchev, Maxim Yu.; Kulikova, Agrippina M. +3 more
Based on the photographic and CCD observations of the relative motion of the A and B components of the binary system ADS 9346 obtained with the 26-inch refractor of Pulkovo Observatory during 1979-2019, we discover an invisible companion associated with star A. Comparison of the ephemerides with the positional and spectroscopic observations allowe…
Physical and orbital properties of the stellar system HIP 43766
Widyan, Hatem; Aljboor, Hussam
In this paper, we present the analysis of the stellar binary system HIP 43766 to determine its properties. We rely on dynamical modeling and atmospheric modeling with recent data to determine the orbital solution and the physical properties of the system. There is a consistency between observed and synthetic photometry obtained using atmospheric m…