Search Publications
LAMOST Medium-resolution Spectroscopic Survey of Galactic Open Clusters (LAMOST-MRS-O): An Overview of Survey Plan and Preliminary Results
Shi, Jianrong; Chen, Li; Zhang, Xi +8 more
As part of the LAMOST medium-resolution spectroscopic survey, the LAMOST-MRS-O is a non-time domain survey that aims to perform medium-resolution spectral observations for member stars in the open cluster areas. This survey plans to obtain the spectroscopic parameters such as radial velocity and metal abundances of member stars and provide data su…
Photometric Metallicities of 0.8 Million KiDS Stars
Chen, Bing-Qiu; Liu, Xiao-Wei; Sun, Bao-Kun
Accurate determinations of metallicity for large, complete stellar samples are essential for advancing various studies of the Milky Way. In this paper, we present a data-driven algorithm that leverages photometric data from the KiDS and the VIKING surveys to estimate stellar absolute magnitudes, effective temperatures, and metallicities. The algor…
Long-period Double-lined Eclipsing Binaries: The System V454 Aur with the Secondary Eclipse Caused by the Occultation of the Hotter Component
Kniazev, Alexei Y.; Malkov, Oleg; Berdnikov, Leonid N. +2 more
We present the results of our study of the long-period eclipsing binary star V454 Aur. The results are based on spectroscopic data obtained with the UFES échelle spectrograph and photometric observations from Transiting Exoplanet Survey Satellite (TESS). The derived radial velocity curve is based on 17 spectra obtained between 2021 and 2023, cover…
New Orbital Parameters of 850 Wide Visual Binary Stars and Their Statistical Properties
Izmailov, Igor; Khovritchev, Maxim
Based on positional observations and measurements of radial velocities, the orbits of 850 wide visual binary stars have been determined. The parameters of the log-normal distributions for the histograms of orbital periods, stellar masses, and semimajor axes in astronomical units have been obtained. The eccentricity histogram for binary stars with …
Modified Masses and Parallaxes of the Close Visual Triple System HD 2893
Masda, Suhail; Al-Wardat, Mashhoor; Aljboor, Hussam +4 more
We present the essential stellar parameters of the close visual triple system HD 2893 using Al-Wardat's method for analyzing binary and multiple star systems in conjunction with Kurucz's model atmospheres. This method accurately computes the spectrophotometric stellar masses through a combined synthetic spectral energy distribution approach that c…
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