Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Beheary M."'
Autor:
Aboueisha, Mohamed S., Saad, A. S., Nouh, Mohamed I., Kamel, Tarek M., Beheary, M. M., Gadallah, Kamel A. K.
Publikováno v:
Physica Scripta, 99, 075052, 2024
In astrophysics, the gravitational stability of a self-gravitating polytropic fluid sphere is an intriguing subject, especially when trying to comprehend the genesis and development of celestial bodies like planets and stars. This stability is the sp
Externí odkaz:
http://arxiv.org/abs/2407.06238
Publikováno v:
Applied Mathematics and Nonlinear Sciences, Vol 2, Iss 2, Pp 559-564 (2017)
We present a synthetic spectra study of two new galactic early-type O4 dwarf stars(ALS 19618 and BD+50886) with high signal-to-noise ratio, typically S/N ∼ 300, medium-rosalution R ∼ 2500 optical spectra of O4 dwarfs stars from Galactic O-Stars S
Externí odkaz:
https://doaj.org/article/ad538974c5ce4f4a8b1906b95d251664
Autor:
Darwish, M. S., Edris, K. A., Richards, A. M. S., Etoka, S., Saad, M. S., Beheary, M. M., Fuller, G. A
Publikováno v:
2020MNRAS.493.4442D
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-GHz methanol and 22 GHz water masers using the MERLIN (Multi-Element Ra
Externí odkaz:
http://arxiv.org/abs/2105.11340
The solar chemical abundances studied in considerable detail because of discrepant values of solar metallicity inferred from different indicators, where in the present work we have used 28 suitable atomic spectral solar nitrogen lines, relying on new
Externí odkaz:
http://arxiv.org/abs/1809.05404
Adopting the thermal free-free emission mechanism, the coronal and chromospheric magnetic fields are derived from the polarization and spectral observations with the Nobeyama Radioheliograph at 1.76 cm. The solar active regions (AR) located near the
Externí odkaz:
http://arxiv.org/abs/1802.04598
We analyze spectropolarimetric observations of the chromospheric Ca II 8542 line taken by the Interferometric Bidimensional Spectrometer (IBIS) at the Dunn Solar Telescope and photospheric Fe I 6302 lines obtained with the Solar Optical Telescope (SO
Externí odkaz:
http://arxiv.org/abs/1712.06828
We analyze spectropolarimetric observations of the chromospheric Ca II 8542 A line taken by the Interferometric Bidimensional Spectrometer (IBIS) at the Dunn Solar Telescope. The data were observed on 2012 January 29 for the NOAA active region 11408.
Externí odkaz:
http://arxiv.org/abs/1712.06829
We study the solar photospheric abundance of singly ionized neodymium (Nd II) using high resolution spectroscopic data obtained by Fourier transform spectrograph (FTS). Based on the Local Thermodynamical Equilibrium (LTE) assumption, a new value of N
Externí odkaz:
http://arxiv.org/abs/1712.06618
Autor:
Shokry, A., Rivinius, Th., Mehner, A., Martayan, C., Hummel, W., Townsend, R. H. D., Mérand, A., Mota, B., Faes, D. M., Hamdy, M. A., Beheary, M. M., Gadallah, K. A. K, Abo-Elazm, M. S.
Publikováno v:
A&A 609, A108 (2018)
Aims. The X-shooter archive of several thousand telluric star spectra was skimmed for Be and Be-shell stars to derive the stellar fundamental parameters and statistical properties, in particular for the less investigated late type Be stars, and the e
Externí odkaz:
http://arxiv.org/abs/1711.02619
Autor:
Darwish, M. S., Elkhateeb, M. M., Nouh, M. I., Saad, S. M., Hamdy, M. A., Beheary, M. M., Gadallah, K., Zaid, I.
We present an orbital solution study for the newly discovered system 1SWASP J080150.03+471433.8 by means of new CCD observations in VRI bands. Our observations were carried out on 25 Feb. 2013 using the Kottamia optical telescope at NRIAG, Egypt. 12
Externí odkaz:
http://arxiv.org/abs/1606.07510