Search Publications
Type Ia Supernova Explosions in Binary Systems: A Review
Han, Zhanwen; Liu, Zheng-Wei; Röpke, Friedrich K.
Type Ia supernovae (SNe Ia) play a key role in the fields of astrophysics and cosmology. It is widely accepted that SNe Ia arise from thermonuclear explosions of white dwarfs (WDs) in binary systems. However, there is no consensus on the fundamental aspects of the nature of SN Ia progenitors and their actual explosion mechanism. This fundamentally…
The Masses of a Sample of Radial-velocity Exoplanets with Astrometric Measurements
Zhao, Gang; Wang, Wei; Xiao, Guang-Yao +6 more
Being one of the most fundamental physical parameter of astronomical objects, mass plays a vital role in the study of exoplanets, including their temperature structure, chemical composition, formation, and evolution. However, nearly a quarter of the known confirmed exoplanets lack measurements of their masses. This is particularly severe for those…
Classifying Globular Clusters and Applying them to Estimate the mass of the Milky Way
Gao, Qi; Liu, Chao; Chen, Xuelei +3 more
We combine the kinematics of 159 globular clusters (GCs) provided by the Gaia Early Data Release 3 (EDR3) with other observational data to classify the GCs, and to estimate the mass of the Milky Way (MW). We use the age-metallicity relation, integrals of motion, action space and the GC orbits to identify the GCs as either formed in situ (Bulge and…
Atmospheric Parameters and Kinematic Information for the M Giant Stars from LAMOST DR9
Qiu, Dan; Tian, Hao; Yang, Ming +5 more
A catalog of more than 43,000 M giant stars has been selected by Li et al. from the ninth data release of LAMOST. Using the data-driven method SLAM, we obtain the stellar parameters (T eff, $\mathrm{log}\,g$ , [M/H], [α/M]) for all the M giant stars with uncertainties of 57 K, 0.25 dex, 0.16 dex and 0.06 dex at SNR > 100, respectivel…
3D Kinematics of Classical Cepheids According to Gaia EDR3 Catalog
Bobylev, V. V.; Bajkova, A. T.
The kinematics of about 2000 classical Cepheids of the Milky Way with data from Gaia EDR3 catalog has been studied. For some of these stars, there are line-of-sight velocities. On the basis of the nonlinear rotation model, the parameters of the rotation curve of the Galaxy were determined. The circular linear rotation velocity of the near-solar ne…
Photometric Properties and Stellar Parameters of the Rapidly Rotating Magnetic Early-B Star HD 345439
Zhang, Yu; Liu, Jin-Zhong; Li, Lei +8 more
We first present the multicolor photometry results of the rapidly rotating magnetic star HD 345439 using the Nanshan One-meter Wide-field Telescope. From the photometric observations, we derive a rotational period of 0.7699 ± 0.0014 day. The light curves of HD 345439 are dominated by the double asymmetric S-wave feature that arises from the magnet…
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…