Search Publications
The spiral structure of the Milky Way
Xu, Ye; Hou, Li-Gang; Wu, Yuan-Wei
The morphology and kinematics of the spiral structure of the Milky Way are long-standing problems in astrophysics. In this review we firstly summarize various methods with different tracers used to solve this puzzle. The astrometry of Galactic sources is gradually alleviating this difficult situation caused mainly by large distance uncertainties, …
The SAGE photometric survey: technical description
Tan, Ke-Feng; Zhao, Gang; Fan, Zhou +4 more
To investigate a huge sample of data related to the Stellar Abundance and Galactic Evolution (SAGE) survey in more detail, we are performing a northern sky photometric survey named SAGES with the SAGE photometric system. This system consists of eight filters: Strӧmgren-u, SAGE-v, SDSS g, r, i, DDO-51, Hα wide and Hα narrow, i…
Machine learning classification of Gaia Data Release 2
Bai, Yu; Wang, Song; Liu, Ji-Feng
Machine learning has increasingly gained more popularity with its incredibly powerful ability to make predictions or calculate suggestions for large amounts of data. We apply machine learning classification to 85 613 922 objects in the Gaia Data Release 2, based on a combination of Pan-STARRS 1 and AllWISE data. The classification results are cros…
The simplest way to get a cluster’s parameters in the Gaia era (Dolidze 41)
Tadross, Ashraf Latif
The astro-photometric parameters of the open star cluster Dolidze 41, which is located in the constellation Cygnus, have been investigated using the Gaia DR2 large survey that is merged with the near infrared Two Micron All Sky Survey (2MASS) database. The radial density distribution (limited, core and tidal radii), color-magnitude diagrams, galac…
Gaia calibrated UV luminous stars in LAMOST
Bai, Yu; Wang, Song; Liu, Ji-Feng
We take advantage of Gaia Data Release 2 to present 275 and 1774 ultraviolet luminous stars in the far ultraviolet (FUV) and near ultraviolet (NUV), respectively. These stars exceed their expected values by 5σ with respect to over one million ultraviolet stars in the log g vs. T eff diagram. Galactic extinction is corrected with a 3D du…
Matching CCD images to a stellar catalog using locality-sensitive hashing
Liu, Bo; Peng, Qing-Yu; Yu, Jia-Zong
The usage of a subset of observed stars in a CCD image to find their corresponding matched stars in a stellar catalog is an important issue in astronomical research. Subgraph isomorphic-based algorithms are the most widely used methods in star catalog matching. When more subgraph features are provided, the CCD images are recognized better. However…
Spectroscopic and photometric studies of a candidate pulsating star in an eclipsing binary: V948 Her
Kahraman Aliçavuş, Filiz
Eclipsing binary stars with a pulsating component are powerful tools that allow us to probe the stellar interior structure and the evolutionary statuses with a good accuracy. Therefore, in this study, spectroscopic and photometric examinations of an eclipsing binary system V948 Her are presented. The primary component of the system is classified t…