Search Publications
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…
Long-term Speckle Interferometric Monitoring of Binary Systems: 2007–2023 Positional Measurements and Orbits of Seven Objects
Mitrofanova, Arina; Dyachenko, Vladimir; Beskakotov, Anatoly +3 more
The results of seventeen years of speckle interferometric monitoring of seven objects (Chara 122Aa, GJ 3010, HIP 1987, GJ 3076, HIP 11253, HIP 11352, and HIP 14929) are presented. Observational data were obtained at the 6 m Big Telescope Alt-azimuthal Special Astrophysical Observatory of the Russian Academy of Science (BTA SAO RAS) from 2007 to th…
The Masses of a Sample of Radial-velocity Exoplanets with Astrometric Measurements
Zhao, Gang; Wang, Wei; Xiao, Guang-Yao +6 more
Being one of the most fundamental physical parameter of astronomical objects, mass plays a vital role in the study of exoplanets, including their temperature structure, chemical composition, formation, and evolution. However, nearly a quarter of the known confirmed exoplanets lack measurements of their masses. This is particularly severe for those…
A New Statistical Distance Scale for Planetary Nebulae, Based on Gaia EDR3
Ali, A.; Mindil, A.; Alghamdi, S. A. +1 more
The present work aims to build a new statistical distance scale for planetary nebulae (PNe) based on a rigorous calibration sample. The distances of the calibration sample are derived from the trigonometric parallax method using the recent measurements of Gaia Early Data Release 3 (Gaia EDR3). The new distance scale is created by applying the well…
Physical and geometrical parameters of CVBS XIV: the two nearby systems HIP 19206 and HIP 84425
Mardini, Mohammad K.; Al-Wardat, Mashhoor A.; Hussein, Abdallah M. +6 more
Data release 2 (DR2) from the Gaia mission was of great help in precise determination of fundamental parameters of Close Visual Binary and Multiple Systems (CVBMSs), especially masses of their components, which are crucial parameters in understanding formation and evolution of stars and galaxies. This article presents the complete set of fundament…
The stellar system HIP 101227: is it a binary, a triple or a quadruple system?
Annuar, Adlyka; Al-Wardat, Mashhoor; Yousef, Zahra Talal +4 more
In this paper, we present the analysis of the stellar system HIP 101227 to determine the actual number of components in the system, and their properties. We use dynamical modeling and complex spectrophotometric (involving atmospheric modeling) techniques with recent data, to determine the physical properties and orbital solution for the system, re…
LAMOST/HRS spectroscopic analysis of two new Li-rich giants
Pan, Kaike; Gao, Qi; Yan, Hong-Liang +9 more
Two Li-rich candidates, TYC 1338-1410-1 and TYC 2825-596-1, were observed by the new high-resolution echelle spectrograph, LAMOST/HRS. Based on their high-resolution and high-signal-to-noise ratio (SNR) spectra, we derived stellar parameters and abundances of 14 important elements for the two candidates. The stellar parameters and lithium abundanc…
Physical and orbital properties of the stellar system HIP 43766
Widyan, Hatem; Aljboor, Hussam
In this paper, we present the analysis of the stellar binary system HIP 43766 to determine its properties. We rely on dynamical modeling and atmospheric modeling with recent data to determine the orbital solution and the physical properties of the system. There is a consistency between observed and synthetic photometry obtained using atmospheric m…
Investigation of the shortest period Am type eclipsing binary TYC 6408-989-1
Tian, Xiao-Man
The first BV bands photometric observations and the low-resolution spectrum of the shortest period Am type eclipsing binary TYC 6408-989-1 have been obtained. The stellar atmospheric parameters of the primary star were obtained through the spectral fitting as follows: Teff = 6990 ± 117 K, log g = 4.25 ± 0.26 cm s-2, [Fe/H] = …
Research on the HIP 18856 binary system
Mitrofanova, Arina; Dyachenko, Vladimir; Beskakotov, Anatoly +5 more
The results of a study on the binary HIP 18856 and construction of its orbit are presented. New observational data were obtained at the BTA of SAO RAS in 2007-2019. Earlier, Cvetković et al. constructed the orbit for this system. However, it is based on six measurements, which cover a small part of the orbit. The positional parameters of the ESA a…