Search Publications
On the Neutron Star/Black Hole Mass Gap and Black Hole Searches
Shao, Yong
Mass distribution of black holes in low-mass X-ray binaries previously suggested the existence of a ~2-5 M ⊙ mass gap between the most massive neutron stars and the least massive black holes, while some recent evidence appears to support that this mass gap is being populated. Whether there is a mass gap or not can potentially shed light…
Discovery of Extended Structure Around Open Cluster COIN-Gaia 13 Based on Gaia EDR3
Chen, Li; Zhong, Jing; Li, Jing +2 more
COIN-Gaia 13 is a newly discovered open cluster revealed by Gaia DR2 data. It is a nearby open cluster with a distance of about 513 pc. Combined with the five-dimensional astrometric data of Gaia EDR3 with higher accuracy, we use the membership assignment algorithm (pyUPMASK) to determine the membership of COIN-Gaia 13 in a large extended spatial …
Candidate Eclipsing Binary Systems with a δ Scuti Star in Northern TESS Field
Kahraman Aliçavuş, F.; Aliçavuş, F.; Ekinci, Ö. +4 more
The existence of pulsating stars in eclipsing binaries has been known for decades. These types of objects are extremely valuable systems for astronomical studies as they exhibit both eclipse and pulsation variations. The eclipsing binaries are the only way to directly measure the mass and radius of stars with a good accuracy (≤1%), while the pulsa…
The Role of Magnetic Fields in Triggered Star Formation of RCW 120
Chen, Zhiwei; Sefako, Ramotholo; Jiang, Zhibo +3 more
We report on the near-infrared polarimetric observations of RCW 120 with the 1.4 m IRSF telescope. The starlight polarization of the background stars reveals for the first time the magnetic field of RCW 120. The global magnetic field of RCW 120 is along the direction of 20°, parallel to the Galactic plane. The field strength on the plane of the sk…
Precise Evolutionary Asteroseismology of High-Amplitude δ Scuti Star AE Ursae Majoris
Fu, Jian-Ning; Xue, Hui-Fang; Niu, Jia-Shu
Stellar structure and evolution theory is one of the bases in modern astronomy. Stellar inner structures and their evolutionary states can be precisely tested by asteroseismology, since the inner information is brought to the stellar surface by the global oscillating waves and becomes observable. For stellar evolutionary speed (i.e., how long time…
The Relative Orientation between Local Magnetic Field and Galactic Plane in Low Latitude Dark Clouds
Wolf, S.; Pandey, J. C.; Choudhury, Gulafsha B. +4 more
In this work, we study the magnetic field morphology of selected star-forming clouds spread over the galactic latitude (b) range -10° to 10°. The polarimetric observations of clouds CB24, CB27 and CB188 are conducted to study the magnetic field geometry of those clouds using the 104 cm Sampurnanand Telescope (ST) located at ARIES, Manora Peak, Nai…
Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility
Wang, Shu; Deng, Li-Cai; Wang, Kun +3 more
The development of large-scale time-domain surveys provides an opportunity to study the physical properties as well as the evolutionary scenario of B-type subdwarfs (sdBs) and M-type dwarfs (dMs). Here, we obtained 33 sdB+dM eclipsing binaries based on the Zwicky Transient Facility (ZTF) light curves and Gaia Early Data Release 3 (EDR3) parallaxes…
A Search for Exoplanets in Open Clusters and Young Associations based on TESS Objects of Interest
Mann, Andrew W.; Gan, Tianjun; Sun, Qinghui +1 more
We report the results of our search for planet candidates in open clusters and young stellar associations based on the Transiting Exoplanet Survey Satellite (TESS) Objects of Interest Catalog. We find one confirmed planet, one promising candidate, one brown dwarf and three unverified planet candidates in a sample of 1229 open clusters from the sec…
The Astrometric Performance Test of 80 cm Telescope at Yaoan Station and Precise CCD Positions of Apophis
Guo, Bifeng; Peng, Qingyu; Chen, Ying +4 more
The 80 cm azimuthal telescope has newly been mounted at Yaoan Station, Purple Mountain Observatory since 2018. The astrometric performance of the telescope is tested in the following three aspects. (a) The geometric distortion of its CCD attached. It is stable in both a single epoch and multi epochs. Eight distortion solutions are derived over abo…
V0644 Ser: An Active Ultrashort Period Contact Binary Star
Zhu, Li-Ying; Xu, Hu-Shan; Thawicharat, Sarotsakulchai +1 more
The photometric solutions of the ultrashort period close binary V0644 Ser based on our new complete BVRI light curves are derived by the Wilson-Devininney code. The results show that V0644 Ser is a W-type shallow contact binary, and the third light was found in the R and I bands. Compared with the light curves in 2011, the amplitude variation of t…