6 papers
Emergence of a lithium dip in ~35 Myr "Snake" Open Clusters
Yun-Yi Zhang, Hai-Jun Tian, Jian-Rong Shi +2
We report the discovery of a lithium dip (Li-dip) in the stellar "Snake" (age = Myr), challenging the classical view that Li-dips emerge only at ages Myr.…
Evaluating the chromospheric structure model of AD Leo using RH1.5D and magnetic field data
Shuai Liu, Jianrong Shi, Huigang Wei +4
Context. The interplay between surface magnetic topology and chromospheric heating in active M dwarfs remains poorly constrained, limiting our understanding of their magnetic cycle…
Systematic search for blue hyper-velocity stars from LAMOST survey
Yongkang Sun, Yang Huang, Jifeng Liu +6
Hypervelocity stars (HVSs) represent a unique class of objects capable of escaping the gravitational pull of the Milky Way due to extreme acceleration events, such as close encount…
Compositions of the Hercules-Aquila Cloud and Virgo Over-density
Dashuang Ye, Cuihua Du, Mingji Deng +4
Based on a sample of K giant from Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) Data Release 8 and a sample of RR Lyrae (RRL) from \textit{Gaia} Data Release 3…
The origin of High-velocity stars considering the impact of the Large Magellanic Cloud
Jiwei Liao, Cuihua Du, Mingji Deng +5
Utilizing astrometric parameters sourced from \textit{Gaia} Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (H…
Dynamical substructures of local metal-poor halo
Dashuang Ye, Cuihua Du, Jianrong Shi +1
Based on 4,\,098 very metal-poor (VMP) stars with 6D phase-space and chemical information from \textit{Gaia} DR3 and LAMOST DR9 as tracers, we apply an unsupervised machine learnin…