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
14 papers · 1 filter
PPMXL and Gaia Morphological Analysis of Melotte 22 (Pleaides) and 25 (Hyades)
W. H. Elsanhoury, M. I. Nouh
In this article, we present a morphological study of the well-known extended sized open clusters in the sky, Melotte 22 (Pleiades) and Melotte 25 (Hyades) with J, H, and Ks regions…
A stable flat entropy-corrected FRW universe
Nasr Ahmed, Sultan Z. Alamri
In this paper, a general entropy-corrected FRW cosmological model has been presented in which a deceleration-to-acceleration transition occurs according to recent observations. We…
Fundamental parameters of isolated galaxy triplets in the local Universe: Statistical study
Amira A. Tawfeek, Gamal B. Ali, Ali Takey +2
Understanding the dynamics of galaxy triplet systems is one of the significant ways of obtaining insight into the dynamics of large galaxy clusters. Toward that aim, we present a d…
Space-time singularities and the theory of retracts
Nasr Ahmed, H. Rafat
In previous publications, we have started investigating some possible applications to the retraction theory in gravitational physics and showed that it can be very useful in provid…
X-ray warm absorber variability of the Seyfert Galaxy Arakelian 564
B. Korany, M. I. Nouh
The aim of this paper is to study the variability of the warm absorber "clouds of ionised gas within AGN", for the Seyfert 1 galaxies Arakelian 564. The X-ray spectra for four XMM-…
The simplest way to get a cluster's parameters in the Gaia era (Dolidze 41)
Ashraf latif Tadross
The astro-photometric parameters of the open star cluster Dolidze 41, which located in the constellation of Cygnus, have been investigated using the Gaia-ESO DR2 large Survey mergi…
Development in Astronomy and Space Science in Africa
Mirjana Pović, Michael Backes, Paul Baki +20
The development of astronomy and space science in Africa has grown significantly over the past few years. These advancements make the United Nations Sustainable Development Goals m…
Physical properties of three short period close binaries: kic 2715417, kic 6050116 and kic 6287172
M. A. NegmEldin, A. Essam, S. M. Yousef
We present the physical parameters of three short period close binaries using the observed data from Kepler Space Telescope. All of these observations were taken in a single bandpa…
On the existence of deformations and dimensional reduction in wormholes and black holes
Nasr Ahmed, H. Rafat
The deformation retract is, by definition, a homotopy between a retraction and the identity map. We show that applying this topological concept to Ricci-flat wormholes/black holes…
GalWeight: A New and Effective Weighting Technique for Determining Galaxy Cluster and Group Membership
Mohamed H. Abdullah, Gillian Wilson, Anatoly Klypin
We introduce GalWeight, a new technique for assigning galaxy cluster membership. This technique is specifically designed to simultaneously maximize the number of bona fide cluster…
Galactic or extragalactic chemical tagging for NGC3201? Discovery of an anomalous CN-CH relation
Bruno Dias, Ignacio Araya, João Paulo Nogueira-Cavalcante +2
(ABRIDGED) The origin of the globular cluster (GC) NGC3201 is under debate. Its retrograde orbit points to an extragalactic origin, but no further chemical evidence supports this i…
The Pleiades apex and its kinematical structure
W. H. Elsanhoury, E. S. Postnikova, N. V. Chupina +4
A study of cluster characteristics and internal kinematical structure of the middle-aged Pleiades open star cluster is presented. The individual star apexes and various cluster kin…
A stable flat universe with variable Cosmological constant in f(R,T) Gravity
Nasr Ahmed, Sultan Z. Alamri
In this paper, a general FRW cosmological model has been constructed in gravity reconstruction with variable cosmological constant. A number of solutions to the field equa…
The Wind/EPACT proton event catalog (1996-2016)
Rositsa Miteva, Susan W. Samwel, Marcus V. Costa-Duarte
We present the finalized catalog of solar energetic proton events detected by Wind/EPACT instrument over the period 1996-2016. Onset times, peak times, peak proton intensity and on…