Publications (28)
Missing pairs in open cluster catalogs
Qingshun Hu, Yufei Cai, Caroline Soubiran +4
Open clusters (OCs) in our Galaxy can be found in pairs, possibly forming physical binaries, or in groups. These objects offer unique insights into the process of star formation an…
Star formation in the circumgalactic high-velocity cloud Complex H
Zhihong He, Wenkang Pang, Kun Wang +2
The accretion of metal-poor gas sustains galactic star formation. In the Milky Way, this process is fueled by high-velocity clouds (HVCs), yet their fundamental properties have rem…
Exploration of morphological coherence in open clusters with a "core-shell'' structure
Qingshun Hu, Yu Zhang, Songmei Qin +3
The study of their morphological coherence allows us to obtain a better understanding of the morphological evolution of open clusters. We employed the ellipsoid fitting method to d…
Census of Blue Straggler Stars in Distant Open Clusters and Maximum Fractional Mass Excess of OC BSS
Qian Cui, Zhihong He, Shunhong Deng +4
We identified blue straggler stars (BSSs) in 53 open clusters utilizing data from Gaia DR3. Most of these clusters are situated in the outer regions of the Galactic disc, encompass…
3D projection analysis: characterizing the morphological stability of nearby open clusters
Qingshun Hu, Songmei Qin, Yangping Luo +1
Context. The study of open cluster morphology is pivotal for exploring their formation and evolutionary processes. Aims. We manage to assess the morphological stability of 105 near…
Multi-mode delta Sct stars from the Zwicky Transient Facility Survey
Qi Jia, Xiaodian Chen, Shu Wang +3
We obtain the largest catalog of multi-mode Sct stars in the northern sky to date using the Zwicky Transient Facility (ZTF) Data Release 20 (DR20). The catalog includes 2254 o…
Gaia DR3 Open Cluster Cepheids: A Unified Catalog with Calibrated Period-Age and Period-Wesenheit Relations
Shunhong Deng, Zhihong He, Anbing Ren +7
Classical Cepheids (CCs) in Galactic open clusters (OCs) provide essential observational constraints for calibrating the period-age relation (PAR) and the period-Wesenheit relation…
A Roche Lobe-filling hot Subdwarf and White Dwarf Binary: possible detection of an ejected common envelope
Jiangdan Li, Christopher A. Onken, Christian Wolf +12
Binaries consisting of a hot subdwarf star and an accreting white dwarf (WD) are sources of gravitational wave radiation at low frequencies and possible progenitors of type Ia supe…
An In-depth Investigation of the Primordial Cluster Pair ASCC 19 and ASCC 21
Qingshun Hu, Yuting Li, Mingfeng Qin +4
Utilizing \texttt{Gaia} data from the literature, we report a new young (8.9~Myr) cluster pair, ASCC~19 and ASCC~21, located near the Orion star-forming complex. The clusters…
Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility
Min Dai, Xiaodian Chen, Kun Wang +3
The development of large-scale time-domain surveys provides an opportunity to study the physical properties as well as the evolutionary scenario of B-type subdwarfs (sdB) and M-typ…
The morphological stability of open clusters: a new 2D perspective
Yuting Li, Qingshun Hu, Yufei Cai +3
Open clusters (OCs) usually evolve gradually as the number of their members changes, which can be manifested in their morphological characteristics. We aim to investigate the morph…
Detection of Ubiquitous Circumbinary Matter in Hot Subdwarfs Formed from Common-Envelope Ejections
Jiangdan Li, Christian Wolf, Jiao Li +7
The formation of compact binary systems is largely driven by their evolution through a common envelope (CE) phase, crucial for understanding phenomena such as type Ia supernovae an…
Unveiling hidden stellar aggregates in the Milky Way: 1656 new star clusters found in Gaia EDR3
Zhihong He, Xiaochen Liu, Yangping Luo +2
We report 1,656 new star clusters found in the Galactic disk (|b|<20 degrees) beyond 1.2 kpc, using Gaia EDR3 data. Based on an unsupervised machine learning algorithm, DBSCAN, and…
Extremely low-mass white dwarf stars observed in Gaia DR2 and LAMOST DR8
Kun Wang, Péter Németh, Yangping Luo +3
We present the first results from our ongoing project to study extremely low mass (ELM) white dwarfs (WDs) ( 0.3$M_{\sun}$) with the Large Sky Area Multi-Object Fibre Spe…
Hot subdwarf stars observed in Gaia DR2 and LAMOST DR5
Yangping Luo, Péter Németh, Licai Deng +1
Combing Gaia DR2 with LAMOST DR5, we spectroscopically identified 924 hot subdwarf stars, among which 32 stars exhibit strong double-lined composite spectra. We measured the effect…
Survey for Distant Stellar Aggregates in Galactic Disk: Detecting Two Thousand Star Clusters and Candidates, along with the Dwarf Galaxy IC10
Zhihong He, Yangping Luo, Kun Wang +5
Despite having data for over 10^9 stars from Gaia, only less than 10^4 star clusters and candidates have been discovered. Particularly, distant star clusters are rarely identified,…
Hot Subdwarf Stars Observed in LAMOST DR1 - Atmospheric parameters from single-lined spectra
Yangping Luo, Peter Nemeth, Chao Liu +2
We present a catalog of 166 spectroscopically identified hot subdwarf stars from LAMOST DR1, 44 of which show the characteristics of cool companions in their optical spectra. Atmos…
The disrupting and growing open cluster spiral arm patterns of the Milky Way
Xiaochen Liu, Zhihong He, Yangping Luo +1
Star clusters provide unique advantages for investigating Galactic spiral arms, particularly due to their precise ages, positions, and kinematic properties, which are further enhan…
A Robust Hot Subdwarfs Identification Method Based on Deep Learning
Lei Tan, Ying Mei, Zhicun Liu +5
Hot subdwarf star is a particular type of star that is crucial for studying binary evolution and atmospheric diffusion processes. In recent years, identifying Hot subdwarfs by mach…
Frequent flare events on the short-period M-type eclipsing binary BX Tri
ChangQing Luo, XiaoBin. Zhang, Kun Wang +8
We present long-term, multi-color photometric monitoring and spectroscopic observations of the short-period M-type eclipsing binary BX Tri. Six flare events were recorded in 4 year…
Misclassified B stars in the Kepler field
Chunguang Zhang, Chao Liu, Yue Wu +7
Stellar fundamental parameters are important in the asteroseismic study of Kepler light curves. However, the most used estimates in the Kepler Input Catalog (KIC) are not accurate…
A Blind All-sky Search for Star Clusters in Gaia EDR3: 886 Clusters within 1.2 kpc of the Sun
Zhihong He, Kun Wang, Yangping Luo +3
Although previous searches for star clusters have been very successful, many clusters are likely still omitted, especially at high Galactic latitude regions. In this work, based on…
Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II. Kinematics
Yangping Luo, Peter Nemeth, Qida Li
Combining the LAMOST radial velocities with Gaia parallaxes and proper motions, we presented 3D Galactic space motions and the orbits of 182 single-lined hot subdwarf stars. These…
Variable stars in the open cluster NGC 2141
Yangping Luo
We report the results of a search for variable stars in the open cluster NGC 2141. Ten variable stars are detected, among which nine are new variable stars and they are classified…
A born ultramassive white dwarf-hot subdwarf super-Chandrasekhar candidate
Changqing Luo, Jiao Li, Chuanjie Zheng +16
Although supernovae is a well-known endpoint of an accreting white dwarf, alternative theoretical possibilities has been discussing broadly, such as the accretion-induced collapse…
Hot subdwarf Atmospheric parameters, Kinematics, and Origins -- Based on 1587 hot subdwarf stars observed in Gaia DR2 and LAMOST DR7
Yangping Luo, Peter Nemeth, Kun Wang +2
Based on the Gaia DR2 catalogue of hot subdwarf star candidates, we identified 1587 hot subdwarf stars with spectra in LAMOST DR7. We present atmospheric parameters for these stars…
Photometric study and period analysis of the contact binary XZ Leonis
Changqing Luo, Xiaobin. Zhang, Licai Deng +2
We present multi-color CCD photometry of the neglected contact binary XZ Leo. Completely covered VRI band light curves and four times of minimum light were obtained. Combining the…
Birthrates and delay times of Type Ia supernovae
Bo Wang, Zhengwei Liu, Yunkun Han +3
Type Ia supernovae (SNe Ia) play an important role in diverse areas of astrophysics, from the chemical evolution of galaxies to observational cosmology. However, the nature of the…