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
50 papers · 1 filter
Long-term Orbital Period Variations of the Eclipsing Dwarf Nova HT Cas
Aykut Ozdonmez, Huseyin Er, Ilham Nasiroglu +7
We present a comprehensive analysis of the long-term orbital period variations in the short-period eclipsing dwarf nova HT Cas. By combining our new high-precision mid-eclipse time…
Spectral Evolution and Photo-ionization Analysis of Nova Cas 2020 (V1391 Cas)
Gamal M. Hamed, Hasan. H. Esenoglu, Almaz. I. Galeev
We present spectroscopic observations of Nova Cas 2020(V1391 Cas) obtained using the Russian Turkish Telescope during different stages of its 2020 outburst. We followed the spectra…
Discovery and description of two young open clusters in the primordial group of NGC 6871
Juan Casado, Yasser Hendy
A primordial group of open clusters containing NGC 6871 is confirmed and described through Gaia DR3 data and the previous literature. It is a star-forming complex containing at lea…
Spectroscopic and Photometric Study of the new Scuti Star ASAS J063309+1810.8
Mohamed I. Nouh, Mohamed Abdel-Sabour, Ahmed Shokry +3
We present BVR observations and low-resolution spectra collected by the Kottamia Astronomical Observatory 1.88 m telescope (KAO) for the new pulsating star ASAS J063309+1810.8 (her…
Spectral Behaviour and Flaring Activity of II Peg in the Ultraviolet
M. R Sanad
We have investigated the spectral behaviour of II Peg binary system in the ultraviolet band by using International Ultraviolet Explorer observations over fifteen years. The ultravi…
Photometric and Spectroscopic Analysis of the SX Phe Star BL Cam
Mohamed Abdel-Sabour, Mohamed I. Nouh, Ahmed Shokry +5
In the present paper, we report the photometric and spectroscopic observations obtained by the 1.88 m telescope at the Kottamia astronomical observatory of the pulsating star BL Ca…
A comprehensive photometric and kinematical characteristic of the newly discovered QCs clusters with Gaia EDR3
W. H. Elsanhoury, Magdy Y. Amin, A. A. Haroon +1
This study reports the first comprehensive astrometric, photometric and kinematical analysis of four newly discovered open clusters; namely QC1, QC2, QC3, and QC4, using astrometri…
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…
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…
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…
Orbits and Individual Masses of Some Visual Binaries
Essam A. Elkholy, Waleed H. Elsanhoury, Mohamed I. Nouh
The orbits of visual binary systems still attract many of the working groups in astronomy. These orbits are the most important and reliable source of the stellar masse. In the pres…
Prediction of the Atmospheric Fundamental Parameters from Stellar Spectra Using Artificial Neural Network
Y. A. Azzam, M. I. Nouh, A. A. Shaker
Innovation in the ground and space-based instruments has taken us into a new age of spectroscopy, in which a large amount of stellar content is becoming available. So, automatic cl…
Breaking the dichotomy between typical and anomalous globular clusters: the case of NGC 3201
Bruno Dias, Ignacio Araya, João Paulo Nogueira-Cavalcante +2
We recently discovered that NGC 3201 has characteristics that set it outside the current twofold classification scheme for Galactic globular clusters (GCs). Most GCs are mono-metal…
Conformable Fractional Polytropic Gas Spheres
E. A. -B. Abd-Elsalam, Mohamed I. Nouh
Lane Emden differential equation of the polytropic gas sphere could be used to construct simple models of stellar structures, star clusters and many configurations in astrophysics.…
Kinematics and Velocity Ellipsoid of Halo Red Giants
Mohamed I. Nouh, Waleed H. Elsanhoury
In the present paper, we aim to determine the kinematical properties, velocity ellipsoid, and Oort constants using a sample of halo red giants. The study is based mainly on the spa…
Long-term Spot Stability in the Post-common-envelope Binary QS Vir
Olivera Latković, Attila Cséki, Gojko Djurašević +3
We observed the post-common-envelope eclipsing binary with a white dwarf component, QS Vir, using the 1.88 m telescope of Kotammia Observatory in Egypt. The new observations were a…
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…
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…
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…
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…
Photometric study of three ultrashort-period contact binaries
L. Liu, S. -B., E. Fernandez Lajus +3
We carried out high-precision photometric observations of three eclipsing ultrashortperiod contact binaries (USPCBs). Theoretical models were fitted to the light-curves by means of…
Solar energetic particles and radio burst emission
Rositsa Miteva, Susan W. Samwel, Vratislav Krupar
We present a statistical study on the observed solar radio burst emission associated with the origin of in situ detected solar energetic particles. Several proton event catalogs in…