Search Publications
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 …
Magnetic flux participation in solar surface magnetism during solar cycle 24
Wang, Jing-Xiu; Jin, Chun-Lan
This study aims at investigating surface magnetic flux participation among different types of magnetic features during solar cycle 24. State-of-the-art observations from SDO/HMI and Hinode/SOT are combined to form a unique database in the interval from April 2010 to October 2015. Unlike previous studies, the statistics presented in this paper are …
CN Andromedae: a shallow contact binary with a possible tertiary component
Soydugan, Faruk; Aliçavuş, Fahri; Yildirim, Muhammed Faruk
In this study, new photometric observations of shallow contact binary CN Andromedae (CN And) were performed and multi-color (BV R) CCD light curves (LCs) were obtained. Simultaneous analysis of new LCs and published radial velocity (RV) data reveals that the system is an early contact binary in which both components have recently filled their inne…
IU Cancri: a solar-type contact binary with mass transfer
Dai, Hai-Feng; Yuan, Hui-Yu; Yang, Yuan-Gui
We present new CCD photometry of the solar-type contact binary IU Cnc, which was observed from November 2017 to March 2018 with three small telescopes in China. BV light curves imply that IU Cnc is a W-type contact binary with total eclipses. The photometric solution indicates that the mass ratio and fill-out factor are q = 4.104 ± 0.004 and f = 3…
X-ray activity from different types of stars
Zhang, Yong; Soria, Roberto; Bai, Yu +10 more
X-ray emission is an important indicator of stellar activity. In this paper, we study stellar X-ray activity using the XMM-Newton and LAMOST data for different types of stars. We provide a sample including 1259 X-ray-emitting stars, of which 1090 have accurate stellar parameter estimations. Our sample size is much larger than those used in previou…
Resource potential and planning for exploration of the Hebrus Valles, Mars
Yadav, Santosh Kumar; Srivastava, Neeraj; Sharma, Ravi
Mars is the only extraterrestrial body which could host primitive lifeforms and also has the potential to host a human base in the near future. Towards fulfilling these objectives, several remote sensing missions and rover based missions have been sent to Mars. Still, confirmation of existing or extinct life on this planet in any form has not been…
Unusual infrared emission toward Sgr B2: possible planar C24
Li, Aigen; Xiang, Fu-Yuan; Yang, Xue-Juan +1 more
Interstellar graphene could be present in the interstellar medium (ISM), resulting from the photochemical processing of polycyclic aromatic hydrocarbon (PAH) molecules and/or collisional fragmentation of graphitic particles. Indeed, by comparing the observed ultraviolet (UV) extinction and infrared (IR) emission of the diffuse ISM with that predic…