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Publikováno v: 拓殖大学理工学研究報告 = Bulletin of science and engineering, Takushoku University. 19:9-15

We address the question whether the transition between ordinary matter and a black hole could be considered as a phase transition. The defining property of the phase transition is that free energy should be continuous at the transition point. We stud

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::ad8cee268c847dabfbb7f893cd46dbc4
http://id.nii.ac.jp/1579/00000540/

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Two-Temperature Model of Advection Dominated Accretion Flow

Autor: Baba, Tamon, Kai, Takashi, Arai, Kenzo

Publikováno v: Physics Reports of Kumamoto University. 13(2):171-182

We investigate the two-temperature model of the Advection Dominated Accretion Flow (ADAF) around a supermassive black hole. Electron temperature is determined from the local balance between energy transfer from ions through Coulomb collisions and rad

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::378294c3e08f8759413c5104f4e3e087
http://hdl.handle.net/2298/18092

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Observational Constraints on Brans-Dicke Theory with a Variable Cosmological Term

Autor: Thushari, E.P.B.A., Nakamura, Riou, Hashimoto, Masa-aki, Arai, Kenzo

Publikováno v: Physics Reports of Kumamoto University. 13(2):217-226

We investigate Big-Bang nucleosynthesis in the Brans-Dicke model with a variable cosmological term (BDA) for the coupling constant ω=10^4. The model parameters are constrained from comparison between the resulting abundance of ^4He, D and ^7Li and t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::b5084bd0994cd6ba9b4af247689fc006
http://hdl.handle.net/2298/18115

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Abundance Distribution in Supernova Remnant Cas A

Autor: Matsuo, Yasuhide, Hashimoto, Masa-aki, Arai, Kenzo

Publikováno v: Physics Reports of Kumamoto University. 13(2):247-254

Two dimensional hydrodynamical simulations of supernova remnant Cas A are performed starting from the onset of explosion to the present phase. Before the explosion, distributions of circumstellar medium is constructed, where the medium is assumed to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::0641f06e0017dcad50e33ecf33389a80
http://hdl.handle.net/2298/18118

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Lithium Production and Soft X-ray Emission in Neutron Star Soft X-Ray Transients Cen X-4 and Aql X-1

Autor: Fujimoto, Shin-ichiro, Matsuba, Ryuichi, Arai, Kenzo

Publikováno v: Physics Reports of Kumamoto University. 13(2):191-200

We investigate production of Li in soft X-ray transients (NSSXTs) during quiescence. Lithium is abundantly synthesized in a hot accretion flow and is transfered to the surface of a secondary star. Almost all charged nuclei in the accretion flow are o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::ee8f504e909394ed6ad94765ec29344a
http://hdl.handle.net/2298/18096

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Effects of Neutrino Transport on the γ-Process Nucleosynthesis for the Explosion of a 3.3 M_sun Helium Star

Autor: Saruwatari, Motoaki, Hashimoto, Masa-aki, Arai, Kenzo

Publikováno v: Physics Reports of Kumamoto University. 13(2):235-246

We investigate γ-process during the magnetohydrodynamical (MHD) explosion of supernova in a helium star of 3.3 M_sun with including the neutrino effects. Contrary to the case of the spherical explosion, jet-like explosion due to the combined effects

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::a0535b597473eba719f04b26372be7e9
http://hdl.handle.net/2298/18117

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Effects of a New Triple-α Reaction Rate on the Helium Ignition of Accreting White Dwarfs

Autor: Saruwatari, Motoaki, Hashimoto, Masa-aki, Arai, Kenzo

Publikováno v: Physics Reports of Kumamoto University. 13(2):255-260

Effects of a new rate of the triple-α reaction on the ignition of a carbon-oxygen white dwarf accreting helium in a binary system have been investigated. The ignition points determine the properties of a thermonuclear explosion of a Type Ia supernov

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::09c963a3e5afda9978d305321a17ca72
http://hdl.handle.net/2298/18119

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The Influence of the Viscosity Prescription on Self-Gravitating Accretion Disk

Autor: Kai, Takashi, Baba, Tamon, Arai, Kenzo, Fujimoto, Shin-ichiro

Publikováno v: Physics Reports of Kumamoto University. 13(2):163-170

We investigate the difference between the accretion disk models based on two kinds of α-prescription of viscosity. The models are constructed with self-gravity in the vertical direction of the disk around a supermassive black hole. It is found that

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=jairo_______::c0be1fbae0de5d7d106a9708d7dfc553
http://hdl.handle.net/2298/18091

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