Search Publications
Two-dimensional Parameter Relationships for W UMa-type Systems Revisited
Poro, Atila; Paki, Ehsan; Hedayatjoo, Mahya +6 more
Reviewing the empirical and theoretical parameter relationships between various parameters is a good way to understand more about contact binary systems. In this investigation, two-dimensional (2D) relationships for P-M V(system), P-L 1,2, M 1,2-L 1,2, and q-L ratio were revisited. The sample…
Optical Transient Source AT2021lfa: A Possible "Dirty Fireball"
Jin, Zhi-Ping; Wei, Da-Ming; Ye, Xue-Mei +1 more
AT2021lfa, also known as ZTF21aayokph, was detected by the Zwicky Transient Facility on 2021 May 4, at 05:34:48 UTC. Follow-up observations were conducted using a range of ground-based optical telescopes, as well as Swift/XRT and VLA instruments. AT2021lfa is classified as an "orphan afterglow" candidate due to its rapid flux decline and its redde…
BSEC Method for Unveiling Open Clusters and its Application to Gaia DR3: 83 New Clusters
Li, Zhong-Mu; Mao, Cai-Yan
Open clusters (OCs) are common in the Milky Way, but most of them remain undiscovered. There are numerous techniques, including some machine-learning algorithms, available for the exploration of OCs. However, each method has its limitations and therefore, different approaches to discovering OCs hold significant values. We develop a comprehensive a…
The Radcliffe Wave Parameters from Data on Open Star Clusters
Bobylev, V. V.; Bajkova, A. T.
A spectral analysis of the vertical positions and velocities of 374 open star clusters (OSCs) was carried out. We took these OSCs from the Hunt and Reffert catalog; they have an average age of about 10 million years, and are located on the galactic plane XY in a narrow zone inclined by 25° to the galactic axis Y. The following estimates of the par…
Confirmation of a Sub-Saturn-size Transiting Exoplanet Orbiting a G Dwarf: TOI-1194 b and a Very Low Mass Companion Star: TOI-1251 B from TESS
Zheng, Jie; Bieryla, Allyson; Howell, Steve B. +18 more
We report the confirmation of a sub-Saturn-size exoplanet, TOI-1194 b, with a mass of about
How Common can the Origin of Clusters Cha I, Cha II, ϵ Cha and η Cha be?
Bobylev, V. V.; Bajkova, A. T.
The trajectories of the groupings η Cha, ϵ Cha and Cha I, Cha II, constructed backward in time, have been studied. We concluded that the hypothesis about the joint formation of all four of these clusters from one molecular cloud cannot be completely excluded. However, 10–15 Myr ago, all these four clusters were located at approximately the same he…
Isochrone Fitting of Galactic Globular Clusters—VI. High-latitude Clusters NGC 5024 (M53), NGC 5053, NGC 5272 (M3), NGC 5466, and NGC 7099 (M30)
Savchenko, S. S.; Gontcharov, G. A.; Il'in, V. B. +7 more
We fit various color–magnitude diagrams (CMDs) of the high-latitude Galactic globular clusters NGC 5024 (M53), NGC 5053, NGC 5272 (M3), NGC 5466, and NGC 7099 (M30) by isochrones from the Dartmouth Stellar Evolution Database and Bag of Stellar Tracks and Isochrones for α–enrichment [α/Fe] = +0.4. For the CMDs, we use data sets from Hubble Space Te…
Astronomical Test with CMOS on the 60 cm Telescope at the Xinglong Observatory, NAOC
Fan, Zhou; Zhang, Yu; Wu, Hong +2 more
This work shows details of an evaluation of an observational system comprising a complementary metal-oxide-semiconductor detector, 60 cm telescope and filter complement. The system's photometric precision and differential photometric precision, and extinction coefficients were assessed through observations of Supersky flat fields, open clusters, s…
BSN: The First Light Curve Analysis of the Total Eclipse Binary System EL Tuc
Poro, Atila; Sarvari, Elham; Fernández Lajús, Eduardo
We conducted the first light curve study of the binary star EL Tuc within the Binary Systems of South and North project's framework. The photometric observations were made using standard multiband BVR c I c filters at an observatory in Argentina. We presented a new ephemeris for EL Tuc and a linear fit to the O – C diagra…
The Astrometric Performance of the China Space Station Telescope (CSST) Sky Survey in Extending the Gaia Celestial Reference Frame
Zhu, Zi; Yao, Jun; Liu, Niu +2 more
The multi-color imaging sky survey conducted by the China Space Station Telescope (CSST) holds significant promise for advancing the development of the celestial reference frame. In this study, we focus on assessing the astrometric performance of the CSST celestial reference frame (CSST-CRF) in extending the Gaia Celestial Reference Frame 3 (Gaia-…