Search Publications
A compilation of known QSOs for the Gaia mission
Liao, Shi-Long; Qi, Zhao-Xiang; Guo, Su-Fen +1 more
Quasars are essential for astrometry in the sense that they are spatially stationary because of their large distance from the Sun. The European Space Agency (ESA) astrometric satellite Gaia is scanning the whole sky with unprecedented accuracy up to the level of a few µas. However, Gaia’s two-fields-of-view-observation strategy may introduce…
Physical properties of γ Doradus pulsating stars and their relationship with long-period δ Scuti variables
Li, Lin-Jia; Qian, Sheng-Bang; Zhu, Li-Ying +3 more
We present LAMOST data on 168 γ Doradus (γ Dor) pulsating stars including stellar atmospheric parameters of 137 variables and spectral types for all of the samples. The distributions of period (P), temperature (T), gravitational acceleration (log(g)) and metallicity [Fe/H] are shown. It is found that most γ Dor variables are main-sequence stars wi…
Joint hard X-ray observations with ASO-S/HXI and SO/STIX
Krucker, Säm; Su, Yang; Hurford, Gordon J. +1 more
This paper discusses the potential of future joint hard X-ray solar flare observations between the Hard X-ray Imager (HXI) onboard the Advanced Space-based Solar Observatory (ASO-S) mission and the Spectrometer/Telescope for Imaging X-rays (STIX) on Solar Orbiter. The different viewing perspectives of the two telescopes relative to the Sun will al…
Orbital and physical parameters of the close binary system GJ 9830 (HIP 116259)
Al-Wardat, Mashhoor A.; Pathan, J. M.; Masda, Suhail G.
We present the complete set of physical and geometrical parameters of the visual close binary system GJ 9830 for the first time by applying Al-Wardat’s complex method. This method combines magnitude difference from speckle interferometry, synthetic spectral energy distributions of the binary components which are constructed based on grids of Kuruc…
Transition-region explosive events produced by plasmoid instability
Li, Dong
Magnetic reconnection is thought to be a key process in most solar eruptions. Thanks to highresolution observations and simulations, the studied scale of the reconnection process has become smaller and smaller. Spectroscopic observations show that the reconnection site can be very small, which always exhibits a bright core and two extended wings w…
A catalog of DB white dwarfs from the LAMOST DR5 and construction of templates
Luo, A. -Li; Kong, Xiao; Li, Xiang-Ru
In this study, we employ machine learning to build a catalog of DB white dwarfs (DBWDs) from the LAMOST Data Release (DR) 5. Using known DBs from SDSS DR14, we selected samples of high-quality DB spectra from the LAMOST database and applied them to train the machine learning process. Following the recognition procedure, we chose 351 DB spectra of …
The abundance of massive compact galaxies at 1.0 < z < 3.0 in 3D-HST/CANDELS
Yuan, Qi-Rong; Lu, Shi-Ying; Gu, Yi-Zhou +1 more
Based on a large sample of massive (M * ⩾ 1010 M ⊙) compact galaxies at 1.0 < z < 3.0 in five 3D-HST/CANDELS fields, we quantify the fractional abundance and comoving number density of massive compact galaxies as a function of redshift. The samples of compact quiescent galaxies (cQGs) and compact star-forming…
New photometric investigation of the low-mass-ratio contact binary star V1853 Orionis
Qian, Sheng-Bang; He, Jia-Jia; Sarotsakulchai, Thawicharat +3 more
Four-color charge-coupled device (CCD) light curves in the B, V, Rc and Ic bands of the total-eclipsing binary system V1853 Orionis (V1853 Ori) are presented. By comparing our light curves with those published by previous investigators, it is determined that the O’Connell effect on the light curves has disappeared. By analyzing those multi-color l…
Galactic halo age estimated from LAMOST DR4 and Gaia DR1
Yuan, Hai-Bo; Huang, Yang; Chen, Bing-Qiu +8 more
The stellar halo is one of the major components in the Milky Way. Research on its age can provide critical constraints on the origin of the stellar halo and further on the formation of our Galaxy. So far, different approaches and samples have been used to estimate the age of the Galactic halo. In our previous paper, we carefully selected 63 field …
Galaxy properties derived with spectral energy distribution fitting in the Hawaii-Hubble Deep Field-North
Xue, Yong-Quan; Gao, Fang-You; Li, Jun-Yao
We compile multi-wavelength data from ultraviolet to infrared (IR) bands as well as redshift and source-type information, for a large sample of 178 341 sources in the Hawaii-Hubble Deep Field-North field. A total of 145 635 sources among the full sample are classified/treated as galaxies and have redshift information available. We derive physical …