Zobrazeno 1 - 7
of 7
pro vyhledávání: '"H. I. Abdel-Rahman"'
Autor:
H. I. Abdel Rahman, Mohamed Darwish
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-14 (2023)
Abstract This paper presents a catalog of approximately 1800 Eclipsing W UMa systems (EWs) using parameters from LAMOST, VSX, ZTF and Gaia. Our detailed statistical analysis includes frequency distributions of parameters, confidence intervals, and hy
Externí odkaz:
https://doaj.org/article/932210bf4a2244859d3ae12682e3f012
Autor:
Y.H.M. Hendy, H. I. Abdel Rahman
Publikováno v:
NRIAG Journal of Astronomy and Geophysics. 11:166-177
Autor:
Sabry A. Mohammed, H. I. Abdel-Rahman
Publikováno v:
NRIAG Journal of Astronomy and Geophysics. 8:180-184
In the present paper, we introduce an algorithm to classify Hickson’s compact groups of galaxies. The algorithm uses the discrimination analysis technique to determine the best set of indicators th...
Autor:
B.A. Marzouk, H. I. Abdel-Rahman
Publikováno v:
NRIAG Journal of Astronomy and Geophysics, Vol 7, Iss 2, Pp 175-179 (2018)
Sunspots are dark regions, it is appearing in the deepest layer of solar atmosphere “photosphere”, and the average number of sunspots has cycle every 11 year approximately. Sunspots cycles were numbered with solar cycle 1 beginning in 1755 and th
In this paper, some statistical distributions of wide pairs included in Double Star Catalogue are investigated. Frequency distributions and testing hypothesis are derived for some basic parameters of visual binaries. The results reached indicate that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2323ad30e9afb6c6685c9b1110f8fd9b
http://arxiv.org/abs/1610.09810
http://arxiv.org/abs/1610.09810
Autor:
M. A. Sharaf, Mohamed I. Nouh, H. I. Abdel-Rahman, I. A. Issa, A. S. Saad, Essam, A. Bakry, F. Y. Kamal, A. M. I. Osman
Publikováno v:
Journal of The Korean Astronomical Society. 42:71-79
In this paper, statistical distribution functions are developed for distance determination of stellar groups. This method depends on the assumption that absolute magnitudes and apparent magnitudes follow a Gaussian distribution function. Due to the l
Publikováno v:
NRIAG Journal of Astronomy and Geophysics, Vol 1, Iss 2, Pp 81-86 (2012)
In this paper the tree clustering technique (the Euclidean separation distance coefficients) is suggested to test how the Hickson compact groups of galaxies (HCGs) are really physical groups. The method is applied on groups of 5 members only in Hicks