| Project/Area Number |
05640313
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | Osaka-Kyoiku University |
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Principal Investigator |
FUKUE Jun Osaka-Kyoiku University, Astronomical Institute, Ass, Prof., 教育学部, 助教授 (80173326)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Astronomy / Accretion Disks / Asfnplysicul Jets / Active Galaxies / X-ray stars / Extradynamic Variables / Protoplanetary Disks |
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| Research Abstract |
We examined the various effects which an accretion disk suffered from irradiation by the central object and/or accretion disk itself. The followings are our main results.
(i) The effect of the Compton drag : The angular momentum of the gas is removed via the Compton drag of the radiation fields when the gas is optically thin. This is the new type driving mechanism, we call it the 'beta accretion disk' .
(ii) We examined the structure and evolution of such a beta disk in relation to protoplanetary disks, X-ray stars, and AGNs.
(iii) We also calculated the emission spectrum from the (relativistic) accretion disk which is irradiated by the central region. The spectrum is remarkably modified.
(iv) In order to explain the electron-positron pair annihilation line in X-ray nova, we constructed the model of an accretion disk wind blown off from the disk and calculated the line-emission spectrum.
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