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Volume 77, Issue 2
Displaying 1-31 of 31 articles from this issue
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Article type: Cover
1988 Volume 77 Issue 2 Pages Cover1-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Article type: Appendix
1988 Volume 77 Issue 2 Pages App1-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Article type: Appendix
1988 Volume 77 Issue 2 Pages B1-B2
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Daiichiro SugimotoArticle type: Article
1988 Volume 77 Issue 2 Pages B3-B5
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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[in Japanese], [in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B6-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B7-B13
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Mariko TAKAHARA, Katsuhiko SATOArticle type: Article
1988 Volume 77 Issue 2 Pages B13-B16
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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T. HATSUDA, M. YOSHIMURAArticle type: Article
1988 Volume 77 Issue 2 Pages B16-B20
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSThe emission rate of the invisible axion due to electron-related processes is evaluated in detail at high temperatures (T〜10MeV) and at high densities (ρ〜10^<14>g・cm^<-3>), relevant to the supernova explosion. If one properly treats relativistic kinematics, no useful bound on the Peccei-Quinn symmetry breaking scale (f_A) is obtained from SN1987a, contrary to the recent argument by others.View full abstractDownload PDF (285K) -
[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B20-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Toshikazu Shigeyama, Ken'ichi NomotoArticle type: Article
1988 Volume 77 Issue 2 Pages B21-B34
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSHydrodynamical models for SN 1987A are compared with the observations. From the expansion velocity and the light curve, constraints on the explosion energy E, the mass of the hydrogen-rich envelope M_<env'> and the mass and distribution of ^<56>Ni are obtained. Models and observations are in reasonable agreement for E/M_<env>=1.5±0.5×10^<50> erg/M_*, M_<env>, 3 M_*, and M_<Ni>〜0.07 M_*. The best fit among the calculated models is obtained for M_<env>=6.7 M_* and E=1.0×10^<51> erg. Mixing of ^<56>Ni in the core and moderate helium enrichment in the envelope are suggested.View full abstractDownload PDF (939K) -
Shigeki MiyajiArticle type: Article
1988 Volume 77 Issue 2 Pages B35-B38
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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S. Kumagai, M. Itoh, T. Shigeyama, K. Nomoto, J. NishimuraArticle type: Article
1988 Volume 77 Issue 2 Pages B39-B42
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSThe X-ray light curve and spectrum from SN 1987A due to Compton degradation of γ-rays from the ^<56>Co decay are calculated and compared with the Ginga and Kvant observations. If mixing of ^<56>Co into outer layers has taken place, the X-rays emerge much earlier than in the case without mixing and the resulting hard X-rays are in reasonable agreement with observations.View full abstractDownload PDF (252K) -
Hiroshi ItohArticle type: Article
1988 Volume 77 Issue 2 Pages B43-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Three Dimensional Adiabatic Explosion of Polytropic Stars. I : Nonlinear Rayleigh-Taylor InstabilityMIKIO NAGASAWA, TAKASHI NAKAMURA, SHOKEN M. MIYAMAArticle type: Article
1988 Volume 77 Issue 2 Pages B44-B56
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSAdiabatic explosions of polytropic stars are investigated numerically by a three dimensional Smoothed Particle Hydrodynamics solving the energy equation. The evolutions of point thermal explosions are almost spherically symmetric in a global sense, but they are found to be unstable against the Rayleigh-Taylor instability. In the linear stage, the small fluctuations appear on the surface of contact discontinuity and they grow in a local dynamical time scale. The typical unstable wavelength, which grows in the nonlinear stage, is comparable to the thickness of the spherical shell. As a result, we have the porous density structure on the expanding shell; its density contrast amounts to a factor of 4〜8 while the column density varies within a factor of two. These results suggest the clumpiness of the ejecta of the supernova explosion. The accompanying mixing motion in the expanding shell can explain the rapidly rising light curve of SN1987A. Because it mixes up the energy source ^<56>Ni towards the outer layer of supernova.View full abstractDownload PDF (910K) -
Y. OyamaArticle type: Article
1988 Volume 77 Issue 2 Pages B57-B64
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSA search was made for high energy neutrinos from SN1987A. Actually, upward-going muons with energy greater than 1.7GeV produced in the near by rock by neutrinos from SN1987A were searched for in a 2140 ton underground water Cherenkov detector, KAMIOKANDE-II. No upward-going muons from the direction of SN1987A were found within the time period between February 23, 1987 and September 1, 1987. The 90% C.L. flux limit of the upward-going muons from SN1987A is found to be 1.2×10^<-13>cm^<-2>s^<-1> for the energy threshold of 1.7GeV. For neutrino energy greater than 1.7GeV, limits on the SN1987A neutrino flux and luminosity are: 2.4×10^<-5>cm^<-2>s^<-1> and 1.6×10^<41>erg・s^<-1> for a cutoff energy E_c=10^<15>eV and a spectral index γ=2.1; and 2.3×10^<-3>cm^<-2>s^<-1> and 4.6×10^<42>erg・s^<-1> for E_c=10^<12>eV and γ=2.7.View full abstractDownload PDF (474K) -
M. MORIArticle type: Article
1988 Volume 77 Issue 2 Pages B65-B68
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSWe constructed a new air shower facility on a mountain in New Zealand to search for ultra-high-energy gamma-rays from supernova 1987A. The facility consists of an array of seventy-six scintillation detectors and three mirror stations. Preliminary results from the array show no clear clustering of events around the supernova.View full abstractDownload PDF (325K) -
[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B69-B70
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B71-B74
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B75-
Published: May 20, 1988
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[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B76-B79
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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TAKASHI NAKAMURAArticle type: Article
1988 Volume 77 Issue 2 Pages B80-B85
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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NAOKI ITOHArticle type: Article
1988 Volume 77 Issue 2 Pages B86-
Published: May 20, 1988
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[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages B87-B97
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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SEIJI ADACHIArticle type: Article
1988 Volume 77 Issue 2 Pages 23-73
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
JOURNAL FREE ACCESSWe consider the propagation of closed bosonic strings in the presence of background fields (graviton and dilaton). The background field equations can be obtained from the requirement that the quantum string theory maintains the Weyl invariance on the world sheet which is a remarkable property of the string theory. Same results can be also derived from the nilpotency condition for the BRST transformation of gauge fixed string action. In addition, it can be shown that the equations have a cosmological constant term from the effect of the string interaction.View full abstractDownload PDF (1894K) -
Yoshio OhnukiArticle type: Article
1988 Volume 77 Issue 2 Pages 74-76
Published: May 20, 1988
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Article type: Appendix
1988 Volume 77 Issue 2 Pages 77-
Published: May 20, 1988
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[in Japanese]Article type: Article
1988 Volume 77 Issue 2 Pages 78-83
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Article type: Appendix
1988 Volume 77 Issue 2 Pages 84-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Article type: Appendix
1988 Volume 77 Issue 2 Pages App2-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Article type: Cover
1988 Volume 77 Issue 2 Pages Cover2-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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Article type: Cover
1988 Volume 77 Issue 2 Pages Cover3-
Published: May 20, 1988
Released on J-STAGE: October 02, 2017
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