Non-Local Effects of Turbulence on the Excitation of Trapped Oscillations in Dwarf-Nova Accretion Disks

Yamasaki Tatsuya; Kato Shoji

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Non-Local Effects of Turbulence on the Excitation of Trapped Oscillations in Dwarf-Nova Accretion Disks

机译：湍流对矮新星吸积盘中陷陷振荡激发的非局部影响

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Inapreviouspaperweshowed,inordertosuggestonepossiblemechanismofquasi-periodicoscillations(QPOs),thatsomeaxiallysymmetricradialoscillationscanbetrappedandexcitedindwarf-novaaccretiondisks.Thisstudywasdonebyusingadiffusion-typeturbulentstresstensor.Theadoptionofadiffusiontypestresstensoris,however,notsuitable,sincetherelaxationtimeofturbulenceinKepleriandisksiscomparablewiththetimescaleoftheoscillations,andthedelayofthetimeresponseoftheturbulencetotheoscillationshasnon-negligibleeffectsontheexcitationofoscillations.Inthispaperwereexaminetheexcitationoftrappedoscillationsondwarf-novadisksbytakingtheeffectsoftheabove-mentionedtimedelayofthestresstensorintoaccount.Theresultsshowthatalthoughthegrowthrateoftrappedoscillationsdecreasesbyafactorof2-3,theoscillationsarestillexcited,exceptforcaseswhenthetemperaturedependenceoftheopacityisweakandtheviscosityissmall.

机译：Inapreviouspaperweshowed，inordertosuggestonepossiblemechanismofquasi-periodicoscillations（QPOS），thatsomeaxiallysymmetricradialoscillationscanbetrappedandexcitedindwarf-novaaccretiondisks.Thisstudywasdonebyusingadiffusion-typeturbulentstresstensor.Theadoptionofadiffusiontypestresstensoris然而，notsuitable，sincetherelaxationtimeofturbulenceinKepleriandisksiscomparablewiththetimescaleoftheoscillations，andthedelayofthetimeresponseoftheturbulencetotheoscillationshasnon-negligibleeffectsontheexcitationofoscillations.Inthispaperwereexaminetheexcitationoftrappedoscillationsondwarf-novadisksbytakingtheeffectsoftheabove-mentionedtimedelayofthestresstensorintoaccount.Theresultsshowthatalthoughthegrowthrateoftrappedoscillationsdecreasesbyafactorof2-3，theoscillationsarestillexcited，exceptforcaseswhenthetemperaturedependenceoftheopacityisweakandtheviscosityissmall。

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《PASJ: Publications of the Astronomical Society of Japan》 |1996年第1期|共页
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Yamasaki Tatsuya; Kato Shoji;
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5. Magnetohydrodynamic turbulence and angular momentum transport in accretion disks. [D] . Pessah, Martin Elias. 2007

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6. Black holes disks and jets following binary mergers and stellar collapse: The narrow range of electromagnetic luminosities and accretion rates [O] . Stuart L. Shapiro -1

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7. Non-Local Effects of Turbulence on the Excitation of Trapped Oscillations in Dwarf-Nova Accretion Disks [O] . Tatsuya Yamasaki, Shoji Kato 1996

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Non-Local Effects of Turbulence on the Excitation of Trapped Oscillations in Dwarf-Nova Accretion Disks

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