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Multi-star System Observations Based on the Direct-imaging Method
Zhao, Gang; Chen, Yi-li; Zhu, Yong-tian +1 more
The direct-imaging exploration can obtain comprehensive physical information of exoplanets, which is a key technology to search for extraterrestrial life in the future. In this paper, based on our recent high-contrast imaging data of ground-based telescope, the newly discovered multi-star candidates are presented. In the early stage, combined with…
A Revisit to the Optical Starlight Polarization Catalogue by Heiles: Distance Update
Meng, Mei-niang; Sun, Xiao-hui
Starlight polarization serves one of the powerful tools to study magnetic fields in the Galactic interstellar medium. Heiles catalogue contains polarization information for 9286 stars, and is by far the biggest. This catalogue has been extensively used to study the magnetic fields. However, the distance parameters of the stars in this catalogue ar…
The Galactic Aberration and Its Impact on Astronomical Reference Frames
Liu, Jia-cheng; Liu, Niu
The Galactic aberration effect, also known as the secular aberration drift, is a consequence of the centripetal acceleration of the Solar System Barycenter in the circular orbit around the Galactic center. It causes distance-independent apparent proper motions (the amplitude is about 5 µas · yr - 1) for extragalactic sources which…
DBSCAN Clustering Algorithm for the Detection of Nearby Open Clusters Based on Gaia-DR2two
Gao, Xin-hua; Wang, Chao; Xu, Shou-kun +1 more
In this paper, we attempt to use the DBSCAN (Density-Based Spatial Clustering of Applications with Noise) clustering algorithm to detect nearby open clusters based on the Gaia Data Release 2 (Gaia-DR2). We select 594284 stars (within a distance of 100 pc to the Sun) from the Gaia-DR2 catalog, and construct a five-dimensional phase space (three-dim…
Research Progresses of Halo Streams in the Solar Neighborhood
Zhao, Gang; Liang, Xi-long; Zhao, Jing-kun +1 more
The stellar streams originated from the Galactic halo may be detected when they pass by the solar neighborhood, and they still keep some information at their birth times. Thus, the investigation of halo streams in the solar neighborhood is very important for understanding the formation and evolution of our Galaxy. In this paper, the researches of …