1989 Fiscal Year Annual Research Report

中性子星への降着流の研究

Research Project

Project/Area Number	01460011
Research Institution	Rikkyo University
Principal Investigator	蓬茨霊運立教大学, 理学部, 教授 (70062601)
Co-Investigator(Kenkyū-buntansha)	井上一宇宙科学研究所, 助教授 (40092142) 柴崎徳明立教大学, 理学部, 講師 (50206124)
Keywords	QPO / X線星 / 質量降着
Research Abstract	X線天文衛星“ぎんが"の観測により低質量連星型X線星に関し次のような重要で新しい観測事実が得られた。 (1)Horizontal branchではQPOと低振動数ノイズ成分の強さがそれぞれ独立に変動している。 (2)X線パルサ-Cen Xー3と4U 1626ー67からもQPOを検出した。上の観測事実をふまえ、Horizontal branch QPOのメカニズムとして有力視されているビ-ト振動数モデルを吟味した。その結果、このモデルで仮定しているplasma clumpと磁場との相互作用は上の観測事実(1)と矛盾すること、更にX線パルサ-に応用すると、パルサ-の降着トルクの理論に修正が必要であることを見出した。中性子星表面からの黒体幅射と降着円盤からの黒体幅射という2成分モデルを用いて観測されている二色図および色一強度図のfittingを行なった。Normal branchにおける強度変動は、かってMitsuda達(1984)が示したように、中性子星表面成分の強度の増減で良く合うが、Horizontal branchは降着円盤からの黒体幅射の温度の変化も必要であることがわかった。現時点ではほぼ当初の目的・計画どうりに研究は進展している。しかし、新たな観測事実が加わるにつれ、エネルギ-スペクトルの性質やQPO現象により複雑な要素が加わってきた。そのため、新たにどの観測事実が降着増、QPOのより重要な情報を担っているのかを選び出す作業が必要となってきた。そこで平成2年3月2、3日、約25人の研究者に立教大学に集まっていただき、ワ-クショップを開いた。現状分析、問題点の堀り下げ、そして活発な理論と観測とのinterplayを行い、示唆に富んだ意見を多く得ることができた。これらをもとにして次年度の目標に迫ることができると考えている。

Research Products
(17 results)

All Other

All Publications (17 results)

[Publications] N.Shigazaki & F.K.Lamb: "Neutron Star Evolution with Internel Heating" The Astrophysical Journal. 346. 808-822 (1989)
[Publications] H.Inoue with the Ginga team: "The Large Area Counter on Ginga" Publications of the Astronomical Society of Japan. 41. 345-372 (1989)
[Publications] K.Hayashida,H.Inoue et al.: "The Origin and Behavior of the Background in the Large Area Countens on Ginga and its Effect on the Sensitifity" Publications of the Astronomical Society of Japan. 41. 373-389 (1989)
[Publications] K.Ebisawa,K.Mitsuda and H.Inoue: "Discovery of 0.08ーHz QuasiーPeriodic Oscillations from the BlackーHole Candidate LMC Xー1" Publications of the Astronomical Socisty of Japan. 41. 519-530 (1989)
[Publications] K.Makishima,H.Inoue R.Hoshi,et al.: "XーRay Spectra of Varying XーRay Emission Components in the LowーMass XーRay Binary G×3+1" Publications of the Astronomical Society of Japan. 41. 531-555 (1989)
[Publications] N.Nakamura,H.Inoue et al.: "Tenna Observation of XーRay Bursts from X1608ー52" Publications of the Astrnomical Society of Japan. 41. 617-639 (1989)
[Publications] N.Shibazaki & T.Ebisuzaki: "Radial Oscillations of Extended Envelopes of Neutron Stars" Publications of the Astronomical Society of Japan. 41. 641-650 (1989)
[Publications] K.Makishima,H.Inoue et al.: "XーRay Spectral Study of M31 with Ginga" Publications of the Astronomical Society of Japan. 41. 697-708 (1989)
[Publications] T.Ohashi,H.Inoue et al.: "XーRay Spectrum of the BL Lacertae Object PKS 2155ー304" Publications of the Astronomical Society of Japan. 41. 709-719 (1989)
[Publications] K.Koyama,H.Inoue et al.: "An Intense Iron Line Emission from NGC 1068" Publications of the Astronomical Society of Japan. 41. 731-737 (1989)
[Publications] R.S.Warwick,H.Inoue,R.Hoshi,et al.: "Hard XーRay Emission from Markation 348" Publications of the Astronomical Society of Japan. 41. 739-744 (1989)
[Publications] K.Kakubari,R.Hoshi and I.Asaoka: "Thermal Instability in OpticaltyーThick Accretion Disks and Emergent XーRay Spectra" Publications of the Astrormical Society of Japan. 41. 1035-1048 (1989)
[Publications] I.Asaoka & R.Hoshi: "The Effect of an Accrtion Disk on Coherent Pulsed Enission from Weakly Magnetized Neutron Stars" Publications of the Astroromical Society of Japan. 41. 1049-1054 (1989)
[Publications] N.Shibazaki,T.Murakami,J.Shahan & K.Nomoto: "Does mess accretion lead to field decay in neutron stars?" Nature. 342. 656-658 (1989)
[Publications] 柴崎徳明: "X線星からの準周期的振動現象(QPO)" 日本物現学会誌. 45. (1990)
[Publications] R.Hashi: "Possible Model Spectra for Bright Low Mass XーRay Binaries" Publications of the Astronomical Society of Japan.
[Publications] K.Shinoda,T.Kii,K.Mitsuda,F.Nagase,Y.Tamaka,K,Masishima and N.Shibazaki: "Discovery of the QuasiーPeriodic Dscillations from the XーRay Pulaer X 1627ー673" Publications of the Astronomical Society of Japan.

1989 Fiscal Year Annual Research Report

中性子星への降着流の研究

Principal Investigator

蓬茨 霊運 立教大学, 理学部, 教授 (70062601)

Research Products

[Publications] N.Shigazaki & F.K.Lamb: "Neutron Star Evolution with Internel Heating" The Astrophysical Journal. 346. 808-822 (1989)

[Publications] H.Inoue with the Ginga team: "The Large Area Counter on Ginga" Publications of the Astronomical Society of Japan. 41. 345-372 (1989)

[Publications] K.Hayashida,H.Inoue et al.: "The Origin and Behavior of the Background in the Large Area Countens on Ginga and its Effect on the Sensitifity" Publications of the Astronomical Society of Japan. 41. 373-389 (1989)

[Publications] K.Ebisawa,K.Mitsuda and H.Inoue: "Discovery of 0.08ーHz QuasiーPeriodic Oscillations from the BlackーHole Candidate LMC Xー1" Publications of the Astronomical Socisty of Japan. 41. 519-530 (1989)

[Publications] K.Makishima,H.Inoue R.Hoshi,et al.: "XーRay Spectra of Varying XーRay Emission Components in the LowーMass XーRay Binary G×3+1" Publications of the Astronomical Society of Japan. 41. 531-555 (1989)

[Publications] N.Nakamura,H.Inoue et al.: "Tenna Observation of XーRay Bursts from X1608ー52" Publications of the Astrnomical Society of Japan. 41. 617-639 (1989)

[Publications] N.Shibazaki & T.Ebisuzaki: "Radial Oscillations of Extended Envelopes of Neutron Stars" Publications of the Astronomical Society of Japan. 41. 641-650 (1989)

[Publications] K.Makishima,H.Inoue et al.: "XーRay Spectral Study of M31 with Ginga" Publications of the Astronomical Society of Japan. 41. 697-708 (1989)

[Publications] T.Ohashi,H.Inoue et al.: "XーRay Spectrum of the BL Lacertae Object PKS 2155ー304" Publications of the Astronomical Society of Japan. 41. 709-719 (1989)

[Publications] K.Koyama,H.Inoue et al.: "An Intense Iron Line Emission from NGC 1068" Publications of the Astronomical Society of Japan. 41. 731-737 (1989)

[Publications] R.S.Warwick,H.Inoue,R.Hoshi,et al.: "Hard XーRay Emission from Markation 348" Publications of the Astronomical Society of Japan. 41. 739-744 (1989)

[Publications] K.Kakubari,R.Hoshi and I.Asaoka: "Thermal Instability in OpticaltyーThick Accretion Disks and Emergent XーRay Spectra" Publications of the Astrormical Society of Japan. 41. 1035-1048 (1989)

[Publications] I.Asaoka & R.Hoshi: "The Effect of an Accrtion Disk on Coherent Pulsed Enission from Weakly Magnetized Neutron Stars" Publications of the Astroromical Society of Japan. 41. 1049-1054 (1989)

[Publications] N.Shibazaki,T.Murakami,J.Shahan & K.Nomoto: "Does mess accretion lead to field decay in neutron stars?" Nature. 342. 656-658 (1989)

[Publications] 柴崎徳明: "X線星からの準周期的振動現象(QPO)" 日本物現学会誌. 45. (1990)

[Publications] R.Hashi: "Possible Model Spectra for Bright Low Mass XーRay Binaries" Publications of the Astronomical Society of Japan.

[Publications] K.Shinoda,T.Kii,K.Mitsuda,F.Nagase,Y.Tamaka,K,Masishima and N.Shibazaki: "Discovery of the QuasiーPeriodic Dscillations from the XーRay Pulaer X 1627ー673" Publications of the Astronomical Society of Japan.

蓬茨霊運立教大学, 理学部, 教授 (70062601)