Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Hamed, Gamal"'
Publikováno v:
New Astronomy,Volume 113, December 2024, 102273
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 spectral evolution of the nova until it entered the nebular phase. The expans
Externí odkaz:
http://arxiv.org/abs/2407.10160
Autor:
Nouh, Mohamed I., Abdel-Sabour, Mohamed, Shokry, Ahmed, Hamed, Gamal M., Fouda, Diaa A., Takey, Ali
Publikováno v:
New Astronomy, Volume 98, article id. 101898, January 2023
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 (hereafter it will be called ASAS06+18). The photometric analysis revealed
Externí odkaz:
http://arxiv.org/abs/2208.07429
Autor:
Abdel-Sabour, Mohamed, Nouh, Mohamed I., Shokry, Ahmed, Hamed, Gamal M., Ismail, Hamed A., Takey, Ali, Ata, Saad A., Zead, Ibrahim
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 Cam. Fourier analysis of the light curves reveals that the fundamental m
Externí odkaz:
http://arxiv.org/abs/2203.15080
Autor:
Hamed, Gamal M.
We study the evolution of the normalized flux of selected ultraviolet emission lines of three classical novae (PW Vul, V1668 Cyg and V1974 Cyg). Different phases ofthe outbursts are studied. We attribute the spectral behavior of the three systems to
Externí odkaz:
http://arxiv.org/abs/1902.07306
Autor:
Nouh, Mohamed I., Abdel-Sabour, Mohamed, Shokry, Ahmed, Hamed, Gamal M., Fouda, Diaa A., Takey, Ali
Publikováno v:
In New Astronomy January 2023 98
Akademický článek
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Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
Abstract Rare oceanic diamonds are believed to have a mantle transition zone origin like super-deep continental diamonds. However, oceanic diamonds have a homogeneous and organic-like light carbon isotope signature (δ13C − 28 to − 20‰) instead
Externí odkaz:
https://doaj.org/article/0a7ae8b37555475286a9bf7024e23645
Autor:
Tanaka, Masaomi, Morokuma, Tomoki, Itoh, Ryosuke, Akitaya, Hiroshi, Tominaga, Nozomu, Saito, Yoshihiko, Stawarz, Lukasz, Tanaka, Yasuyuki T., Gandhi, Poshak, Ali, Gamal, Aoki, Tsutomu, Contreras, Carlos, Doi, Mamoru, Essam, Ahmad, Hamed, Gamal, Hsiao, Eric Y., Iwata, Ikuru, Kawabata, Koji S., Kawai, Nobuyuki, Kikuchi, Yuki, Kobayashi, Naoto, Kuroda, Daisuke, Maehara, Hiroyuki, Matsumoto, Emiko, Mazzali, Paolo A., Minezaki, Takeo, Mito, Hiroyuki, Miyata, Takashi, Miyazaki, Satoshi, Mori, Kensho, Moritani, Yuki, Morokuma-Matsui, Kana, Morrell, Nidia, Nagao, Tohru, Nakada, Yoshikazu, Nakata, Fumiaki, Noma, Chinami, Ohsuga, Ken, Okada, Norio, Phillips, Mark M., Pian, Elena, Richmond, Michael W., Sahu, Devendra, Sako, Shigeyuki, Sarugaku, Yuki, Shibata, Takumi, Soyano, Takao, Stritzinger, Maximilian D., Tachibana, Yutaro, Taddia, Francesco, Takaki, Katsutoshi, Takey, Ali, Tarusawa, Ken'ichi, Ui, Takahiro, Ukita, Nobuharu, Urata, Yuji, Walker, Emma S., Yoshii, Taketoshi
We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey (KISS). The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observati
Externí odkaz:
http://arxiv.org/abs/1409.1309
Autor:
Hamed Gamal El Dien, Shoji Arai, Luc-Serge Doucet, Zheng-Xiang Li, Youngwoo Kil, Denis Fougerouse, Steven M. Reddy, David W. Saxey, Mohamed Hamdy
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-12 (2019)
Chromian-spinel from mafic-ultramafic rocks is used as a reliable geotectonic and mantle melting indicator. Here, the authors argue that this only works partially – it can be used to assess information on mantle metasomatic processes but not petrog
Externí odkaz:
https://doaj.org/article/2177239028f94a518d626e757c349751
Global geochemical fingerprinting of plume intensity suggests coupling with the supercontinent cycle
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019)
The links between plate tectonics and deep mantle structure remain unclear. Here, the authors demonstrate that transition elements (Ni, Cr, and Fe/Mn) in basaltic rocks can be used as a tool to trace plume-related magmatism through Earth history, and
Externí odkaz:
https://doaj.org/article/1a347e4d867d4a32a0759d9fb84b3bbf