Search Publications
LISC Catalog of Open Clusters III. 83 Newly Found Galactic Disk Open Clusters Using Gaia EDR3
Wang, Feng; Li, Zhongmu; Chi, Huanbin
As groups of coeval stars born from the same molecular cloud, an open cluster (OC) is an ideal laboratory for studying the structure and dynamical evolution of the Milky Way. The release of high-precision Gaia Early Data Release 3 (Gaia EDR3) and modern machine-learning methods offer unprecedented opportunities to identify OCs. In this study, we e…
Light Curve Analysis of the AP Dor Binary System using Ground-based and TESS Observations
Poro, A.; Fernández-Lajús, E.; Madani, M. +3 more
The short-period eclipsing binary AP Dor's first in-depth and multiband photometric solutions are presented. We made use of our eight nights of ground-based opportunity at a southern hemisphere observatory, and twelve sectors of TESS observations. We extracted eight and 1322 minima from our observations and TESS, respectively. We suggest a new lin…
Identifying Symbiotic Stars with Machine Learning
Lü, Guoliang; Guo, Sufen; Jia, Yongle +3 more
Symbiotic stars are interacting binary systems, making them valuable for studying various astronomical phenomena, such as stellar evolution, mass transfer, and accretion processes. Despite recent progress in the discovery of symbiotic stars, a significant discrepancy between the observed population of symbiotic stars and the number predicted by th…
Unveiling the Initial Conditions of Open Star Cluster Formation
Hao, C. J.; Xu, Y.; Hou, L. G. +2 more
Open clusters (OCs) are infrequent survivors of embedded clusters gestated in molecular clouds. Up to now, little is known about the initial conditions for the formation of OCs. Here, we studied this issue using high-precision astrometric parameters provided by Gaia data release 3. The statistics show that the peculiar motion velocities of OCs var…
Contributions of Rotation, Expansion and Line Broadening to the Morphology and Kinematics of the Inner CSE of Oxygen-rich AGB Star R Hya
Diep, Pham Ngoc; Ngoc, Nguyen Bich; Nhung, Pham Tuyet +4 more
We use archival ALMA observations of the CO(2-1) and SiO(5-4) molecular line emissions of AGB star R Hya to illustrate the relative contributions of rotation, expansion and line broadening to the morphology and kinematics of the circumstellar envelope (CSE) within some ~70 au (~0.″5) from the centre of the star. We give evidence for rotation and i…
A Catalog of Quasar Candidates Identified by Astrometric and Mid-infrared Methods in Gaia EDR3
Liao, Shilong; Qi, Zhaoxiang; Tang, Zhenghong +3 more
Quasars are very important in materializing the reference frame. The excess emission of active galactic nuclei (AGNs) in the mid-infrared band can be used to identify quasar candidates. As extremely distant and point-like objects, quasars also could be further selected by an astrometry method. Increasing the number of reliable quasar candidates is…
IP Lyn: A Totally Eclipsing Contact Binary with an Extremely Low Mass Ratio
Meng, Zi-Bin; Yu, Yun-Xia; Hu, Ke +4 more
We present the first photometric and orbital period investigations for a neglected totally eclipsing contact binary IP Lyn. The photometric solutions derived from both ground-based and several surveys' observations suggest that it is a shallow contact binary with an extremely low mass ratio of 0.055. The weak asymmetry observed in our multiple ban…
The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni
Jagirdar, Rukmini; Devarapalli, Shanti Priya; Pothuneni, Ravi Raja
The first photometric, spectroscopic and period variation studies of neglected short-period eclipsing binary V2840 Cygni are presented. High mass ratio contact binaries (HMRCBs), especially those in the weak-contact configuration, are vital when probing the evolutionary models of contact binaries (CBs) using stellar parameters. The photometric sol…
Modified Masses and Parallaxes of Close Binary Systems: HD 39438
Masda, Suhail; Yousef, Z. T.; Al-Wardat, Mashhoor +1 more
We present the detailed fundamental stellar parameters of the close visual binary system HD 39438 for the first time. We used Al-Wardat's method for analyzing binary and multiple stellar systems. The method implements Kurucz's plane parallel model atmospheres to construct synthetic spectral energy distributions (SEDs) for both components of the sy…
An Update of the Catalog of Radial Velocity Standard Stars from the APOGEE DR17
Huang, Yang; Luo, A. -Li; Dong, Xiao-Bo +2 more
We present an updated catalog of 46,753 radial velocity (RV) standard stars selected from the APOGEE DR17. These stars cover the Northern and Southern Hemispheres almost evenly, with 62% being red giants and 38% being main sequence stars. These RV standard stars are stable on a baseline longer than 200 days (with 54% longer than one year and 10% l…