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
20 papers · 1 filter
Fundamental parameters of some B-type stars using NOAO Indo-U.S. Library
A. Shokry, M. I. Nouh, S. M. Saad +1
In the present article, we present a spectroscopic analysis of 83 field B-type stars from NOAO Indo-U.S. Library. We calculated the fundamental parameters e.g effective temperature…
CoBiToM Project -- II: Evolution of contact binary systems close to the orbital period cut-off
G. A. Loukaidou, K. D. Gazeas, S. Palafouta +7
Ultra-short orbital period contact binaries (Porb < 0.26 d) host some of the smallest and least massive stars. These systems are faint and rare, and it is believed that they have r…
The Scientific Observation Campaign of the Hayabusa-2 Capsule Re-entry
E. K. Sansom, H. A. R. Devillepoix, M. -Y. Yamamoto +19
On 5th December 2020 at 17:28 UTC, the Japan Aerospace Exploration Agency's Hayabusa-2 sample return capsule came back to the Earth. It re-entered the atmosphere over South Austral…
Spectroscopic Confirmation of a Protocluster at with a High Fraction of Quiescent Galaxies
Ian McConachie, Gillian Wilson, Ben Forrest +10
We report the discovery of MAGAZ3NE J095924+022537, a spectroscopically-confirmed protocluster at around a spectroscopically-confirmed -quiesc…
Kinematics And Ellipsoidal Motion Of The Mid To Late M-Type Stars
W. H. Elsanhoury, M. I. Nouh, Richard L. Branham +1
Truly, kinematics in the Solar neighborhood has provided important information both for the structure and for the evolution of the Galaxy since the early 20th century. The relation…
Stability Analysis of Relativistic Polytropes
A. S. Saad, M. I. Nouh, A. A. Shaker +1
A main question in astrophysics and cosmology has been the severe stability of the astrophysical objects, whether a particular equilibrium configuration is stable. In this article,…
Possible Relations between Brightest Central Galaxies and Their Host Galaxies Clusters and Groups
R. M. Samir, A. A. Shaker
The r-band of the Sloan Digital Sky Survey (SDSS) for 17,924 brightest cluster galaxies (BCGs) in clusters and groups within 0.02 z 0.20 are used to study possible environmental re…
A Hybrid Genetic-Fuzzy Controller for a 14-inches Astronomical Telescope Tracking
Doaa Eid, Abdel-Fattah Attia, Said Elmasry +1
The performance of on telescope depend strongly on its operating conditions. During pointing the telescope can move at a relatively high velocity, and the system can tolerate traje…
Study of an intermediate age open cluster IC 1434 using ground-based imaging and Gaia DR2 astrometry
Y. H. M. Hendy, D. Bisht
We present a detailed photometric and kinematical analysis of poorly studied open cluster IC 1434 using CCD VRI, APASS, and Gaia DR2 database for the first time. BY determining the…
The X-CLASS survey: A catalogue of 1646 X-ray-selected galaxy clusters up to z1.5
E. Koulouridis, N. Clerc, T. Sadibekova +25
Cosmological probes based on galaxy clusters rely on cluster number counts and large-scale structure information. X-ray cluster surveys are well suited for this purpose, since they…
Methanol and water maser observations separate disc and outflow sources in IRAS 19410+2336
M. S. Darwish, K. A. Edris, A. M. S. Richards +4
We investigate the kinematics of high mass protostellar objects within the high mass star forming region IRAS 19410+2336. We performed high angular resolution observations of 6.7-G…
A new topological perspective of expanding space-times with applications to cosmology
Nasr Ahmed, Anirudh Pradhan, F. Salama
We discuss the possible role of the Tietze extension theorem in providing a rigorous topological base to the expanding space-time in cosmology. A simple toy model has been introduc…
Gaia astrometric and photometric study of open clusters (Dolidze 18 & Ruprecht 70)
A. L. Tadross, Y. M. Hendy
Here, we conducted a photometric and astrometric study of two open stellar clusters Dolidze-18 and Ruprecht-70, which have not been photometrically studied before. The most importa…
Gravitational interaction signatures in isolated galaxy triplet systems: a photometric analysis
Amira A. Tawfeek, Kanak Saha, Kaustubh Vaghmare +7
Galaxy triplets are interesting laboratories where we can study the formation and the evolution of small and large systems of galaxies. This study aims to investigate signs of inte…
Photometric and kinematical analysis of Koposov 12 and Koposov 43 open clusters
W. H. Elsanhoury
We present a photometric and kinematical analysis of two and poorly studied open clusters; Koposov 12 (FSR 802) and Koposov 43 (FSR 848) by using cross-matched data from PPMXL and…
An investigation of open cluster Melotte 72 using Gaia DR2
Yasser Hendy, Ashraf Tadross
The estimation of the main parameters of star clusters is significant in astrophysical studies. The most important aspect of using the Gaia DR2 survey lies in the positions, parall…
Inclusive education and research through African Network of Women in Astronomy and STEM for GIRLS in Ethiopia initiatives
Mirjana Pović, Vanessa McBride, Priscilla Muheki +11
The African Network of Women in Astronomy and STEM for GIRLS in Ethiopia initiatives have been established with aim to strengthen the participation of girls and women in astronomy…
CoBiToM Project -- I. Contact Binaries Towards Merging
K. D. Gazeas, G. A. Loukaidou, P. G. Niarchos +6
Binary and multiple stellar systems are numerous in our solar neighborhood with 80 per cent of the solar-type stars being members of systems with high order multiplicity. The Conta…
OH maser toward IRAS 06056+2131: polarization parameters and evolution status
Mohamed Said darwish, Anita M. S. Richards, Sandra Etoka +4
We present high angular resolution observations of OH maser emission towards the high-mass star forming region IRAS 06056+2131. The observations were carried out using the UK radio…
Note on Dark Energy and Cosmic Transit in a scale-invariance cosmology
Nasr Ahmed, Tarek M. Kamel
In general, the laws of physics are not invariant under a change of scale. To find out whether the 'scale-invariance hypothesis' corresponds to nature or not, a careful examination…