A5037689467- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Quantum, superfluid, helium dynamics
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Mechanics and Biomechanics Studies
- Scientific Research and Discoveries
- Quantum Electrodynamics and Casimir Effect
- Experimental and Theoretical Physics Studies
- Quantum Mechanics and Applications
- Space Satellite Systems and Control
- Molecular spectroscopy and chirality
- Dynamics and Control of Mechanical Systems
Al al-Bayt University
1998-2023
University of Sharjah
2020-2023
Astronomy and Space
2021-2022
Al-Hussein Bin Talal University
2007-2014
Yarmouk University
2012-2013
Universidad de Granada
2008
Abstract We present the essential stellar parameters of HD 2893 close visual triple system using Al-Wardat's method for analyzing binary and multiple star systems in conjunction with Kurucz's model atmospheres. This accurately computes spectrophotometric masses through a combined synthetic SED approach that compares results observed data. The vigorous uses spectroscopic, photometric, dynamical analysis to yield precise results. implements Gaia DR3 measurements other like those Hipparcos...
Abstract We present the complete set of atmospheric and fundamental parameters, in addition to masses, for individual components eight stellar systems. The list systems, whose orbital solutions were published recently, includes seven binaries (HIP 14524, HIP 16025, 46199, 47791, 60444, 61100, 73085) one triple system 28671). systems analyzed using a spectrophotometric computational technique known as Al-Wardats method analyzing binary multiple which makes use ATLAS9 line-blanketed...
Abstract We present detailed analyses of eight triple stellar systems (lying between 20 and 155 pc) nine quadruple 250 with different configurations. Most these are hierarchical. The HIP 4239, 5588, 11072, 12548, 13498, 17895, 19915, 22607, 25240, 28614, 41171, 51255, 51966, 54611, 78977, 89234, 111805. followed a method that can be applied to all multiple systems, including the main sequence subgiant evolutionary stages, obtain their masses, ages, atmospheric fundamental parameters. These...
This study presents a comprehensive chemo-dynamical analysis of LAMOST J1109+0754, bright (V = 12.8), extremely metal-poor (\abund{Fe}{H} $-3.17$) star, with strong \textit{r}-process enhancement (\abund{Eu}{Fe} +0.94 $\pm$ 0.12). Our results are based on the 7-D measurements supplied by $Gaia$ and chemical composition derived from high-resolution ($R\sim 110,000$), high signal-to-noise ratio ($S/N \sim 60)$ optical spectrum obtained 2.4\,m Automated Planet Finder Telescope at Lick...
The data release DR2 of Gaia mission was great help in precise determination fundamental parameters Close Visual Binary and Multiple Systems (CVBMSs), especially masses their components, which are crucial understating formation evolution stars galaxies. This article presents the complete set two nearby (CVBSs), these HIP 19206 84425. We used a combination methods; first one is Tokovinin's dynamical method to solve orbit system estimate orbital elements mass sum, second Al-Wardat's for...
Abstract The spectral energy distributions between λ 3700 Å and 8100 of the binary systems COU1289 COU1291 have been measured with Carl‐Zeiss‐Jena 1 m telescope Special Astrophysical Observatory. Their B, V, R magnitudes B – V colour indices were computed compared earlier investigations. Model atmospheres both constructed using a grid Kurucz blanketed models, their in continuous spectrum observational ones. model atmosphere parameters for components derived as: T eff = 7100 K, b 6300 log g...
Abstract Atmospheric modelling of the components visually close binary systems Hip70973 and Hip72479 was used to estimate individual physical parameters their components. The model atmospheres were constructed using a grid Kurucz solar metalicity blanketed models compute synthetic spectral energy distribution for each component separately, hence combined system. total observational distributions as reference comparison with ones. We feedback modified iteration method obtain best fit between...
Abstract We illustrate the evolution of peculiar behavior high mass X-ray binary GX 301-2, through wind accretion model. found that donor this system has 43 M⨀ and clearly it experienced a exchange. As result, low terminal velocity from (1200 km/s), slow rotation relatively luminosity (3.1×10 35 erg/s), can easily fed neutron star via stellar with enough matter. This will lead to explain observed X-rays. It been shown characteristics mass-loss rate winds would reasonably be expected alter...
Model atmospheres of the close visual binary star Cou 1511 (HIP 12552) are constructed using grids Kuruz's blanketed models to build individual synthetic spectral energy distributions (SEDs) for both components. These SEDs combined together entire system and compared with observational one following Al-Wardat's complex method analyzing stars. The SED is used as a reference comparison between observed one. parameters components derived as: Taeff = 6180 ± 50K, Tbeff 5865 70K, log ga 4.35 0.12,...
In this study, we report a probabilistic insight into the stellar mass and supernovae (SNe) explosion energy of possible progenitors five CEMP-no stars. This was done by direct comparison between abundance ratios [X/Fe] light-elements predicted nucleosynthetic yields SN high-mass metal-free suggests with range 11 - 22\,M$_{\odot}$ energies $0.3 1.8 \times 10^{51}$\,erg. The coupling chemical abundances kinematics derived from $Gaia$ DR2 that our sample do not enter outer-halo region....
Abstract Model atmospheres of the components visually close binary system Hip 11352 were constructed using a grid Kurucz's blanketed models. The entire observational spectral energy distribution was used as reference for comparison with synthetic ones created from model atmospheres. parameters derived T eff = 5650 ± 50 K, b 5550 log g 4.47 0.13, 4.49 R 0.92 0.03 ⊙ , 0.88 0.02 M 0.93 0.05 0.89 type G7 primary and G9 secondary. magnitudes both calculated Johnson‐Cousins, Strömgren, Tycho...
The visually close binary system HD25811 is analyzed to estimate its physical and geometrical parameters in addition spectral type luminosity class. method depends on obtaining the best fit between entire observational energy distribution (SED) of synthetic SEDs created by atmospheric modeling individual components, consistent with system's modified orbital elements. components are derived as: $T_{\rm eff}^{\rm a} =6850\pm50$\,K, b} =7000\pm50$\,K, log $g_{\rm a}=4.04\pm0.10$,...
We have considered the existence of neutron star magnetic field given by cyclotron lines. collected data 9 sources high-mass X-ray binaries with supergiant companions as a case testing our model, to demonstrate their distribution and evolution. The wind velocity, spin period strength are studied under different mass loss rate. In correlations between mass-loss rate velocity found can be tested in further observations. examined parameter space where accretion is allowed, avoiding barrier...
We present the complete set of physical and geometrical parameters visual close binary system GJ\,9830 for first time by using Al-Wardat's complex method. This method combines magnitude difference from speckle interferometry, synthetic spectral energy distributions components which are constructed depending on grids Kurucz blanketed models (Atlas9), along with orbital solution Tokovinin's dynamical to estimate individual components. The analysis photometry resulted in following parameters:...