125 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Northern Border UniversitySA30 papers
- Centre National de la Recherche ScientifiqueFR16 papers
- Taibah UniversitySA16 papers
- Cairo UniversityEG12 papers
- Instituto de Astrofísica de AndalucíaES11 papers
- Université Paris CitéFR11 papers
- Astrophysique, Instrumentation et ModélisationFR10 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR10 papers
- Leibniz Institute for Astrophysics PotsdamDE10 papers
- Sorbonne UniversitéFR10 papers
- Astronomical ObservatoryRS9 papers
- CEA Paris-SaclayFR9 papers
19 papers · 1 filter
Statistical Evidence for Contributions of Flares and Coronal Mass Ejections to Major Solar Energetic Particle Events
G. Trottet, S. Samwel, K. -L. Klein +2
Solar energetic particle (SEP) events are related to flares and coronal mass ejections (CMEs). This work is a new investigation of statistical relationships between SEP peak intens…
Detailed ROSAT X-ray Analysis of the AM Her Cataclysmic Variable VV Pup
M. I. Nouh, E. El Kholy
VV Pup is typical system of AM Her stars, where the main accreting pole rotates in and out of view during the orbital cycle. In the present paper we present ROSAT data analysis for…
Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-Loud Narrow-Line Seyfert 1 Galaxy?
Masaomi Tanaka, Tomoki Morokuma, Ryosuke Itoh +55
We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey (KISS). The source brightened in the optical by at le…
Distortion of Infall Regions in Redshift Space-I
Mohamed H. Abdullah, Elizabeth A. Praton, Gamal B. Ali
We show that spherical infall models (SIMs) can better describe some galaxy clusters in redshift slice space than in traditional axially-convolved projection space. This is because…
Studying the Dynamical Properties of 20 Nearby Galaxy Clusters
Mohamed H. Abdullah, Gamal B. Ali, H. A. Ismail +1
Using SDSS-DR7, we construct a sample of 42382 galaxies with redshifts in the region of 20 galaxy clusters. Using two successive iterative methods, the adaptive kernel method and t…
First Orbital Solution and Evolutionary State for the Newly Discovered Eclipsing Binaries USNO-B1.0 1091-0130715 and GSC-03449-0680
M. M. Elkhateeb, M. I. Nouh, R. H. Nelson
First photometric study for the newly discovered systems USNO-B1.0 1091-0130715 and GSC-03449-0680 were applied by means of recent windows interface version of the Wilson and Devin…
Modern Comprehensive study of the W UMa System TY Boo
M. M. Elkhateeb, M. I. Nouh, A. S. Saad
New CCD three colors light curves of TY Boo were carried out in five nights from February to May 2006 in BVR bandpass using a 50-cm F/8.4 Ritchey Chretien telescope (Ba50) of the B…
A New Analytical Solution to the Relativistic Polytropic Fluid Spheres
Mohamed Nouh, Abdelnaby Saad
This paper introduces an accelerated power series solution for Tolman-Oppenheimer-Volkoff (TOV) equation, which represents the relativistic polytropic fluid spheres. We constructed…
An Extensive Photometric Investigation of the W UMa System DK Cyg
M. M. Elkhateeb, M. I. Nouh, E. Elkholy +1
DK Cyg (P = 0.4707) is a W Ursae Majoris type eclipsing binary system that undergoes complete eclipses. All the published photoelectric data have been collected and utilized to re-…
White Dwarf Stars as Polytropic Gas Spheres
M. I. Nouh, A. S. Saad, M. M. Elkhateeb +1
Due to the highly degeneracy of electrons in white dwarf stars, we expect that the relativistic effects play very important role in these stars. In the present article, we study th…
Attitude dynamics and control of spacecraft using geomagnetic Lorentz force
Yehia A. Abdel-Aziz, Muhammad Shoaib
The attitude stabilization of a charged rigid spacecraft in Low Earth Orbit (LEO) using torques due to Lorentz force in pitch and roll directions is considered. A spacecraft that g…
Equilibria of a charged artificial satellite subject to gravitational and Lorentz torques
Yehia A. Abdel-Aziz, Muhammad Shoaib
Attitude Dynamics of a rigid artificial satellite subject to gravity gradient and Lorentz torques in a circular orbit is considered. Lorentz torque is developed on the basis of the…
PPMXL photometric study of four open cluster candidates (Ivanov 2, Ivanov 7, Ivanov 9 and Harvard 9)
A. L. Tadross, R. Bendary
The astrophysical parameters of four unstudied open star cluster candidates - Harvard 9, Ivanov 2, Ivanov 7, and Ivanov 9 - have been estimated for the first time using the PPMXL d…
The 2XMMi/SDSS Galaxy Cluster Survey. III. Clusters associated with spectroscopically targeted luminous red galaxies in SDSS-DR10
A. Takey, A. Schwope, G. Lamer
We present a sample of 383 X-ray selected galaxy groups and clusters with spectroscopic redshift measurements (up to z ~ 0.79) from the 2XMMi/SDSS Galaxy Cluster Survey. The X-ray…
The Astrophysical Behavior of Open Clusters along the Milky Way Galaxy
A. L. Tadross
The main aim of this paper is to study the astrophysical behavior of open clusters' properties along the Milky Way Galaxy. Near-IR JHK (2MASS) photometry has been used for getting…
New CCD photometric observation of the W-UMa eclipsing binary system 1swasp j160156.04+202821.6
A. Essam, Nasser M. A
New BVRI light curves of the eclipsing binary system 1SWASP J160156.04+202821.6 have been obtained with the 1.88-m telescope of Kottamia Astronomical Observatory (KAO), Egypt on Ju…
Photometric Investigation of the Total-Eclipsing Contact Binary V12 in the Intermediate-age Open Cluster NGC 7789
S. -B. Qian, A. Essam, J. -J. Wang +3
NGC 7789 is an intermediate-age open cluster with an age that is similar to the mean age of contact binary stars. V12 is a bright UMa-type binary star with an orbital period of 0.3…
Current and future capabilities of the 74-inch telescope of Kottamia astronomical observatory in Egypt
Y. A. Azzam, G. B. Ali, F. Elnagahy +4
In this paper, we are going to introduce the Kottamia Astronomical Observatory, KAO, to the astronomical community. The current status of the telescope together with the available…
Fluid sphere: stability problem and dimensional constraint
Farook Rahaman, Anirudh Pradhan, Nasr Ahmed +3
We study different dimensional fluids inspired by noncommutative geometry which admit conformal Killing vectors. The solutions of the Einstein field equations examined specifically…