Hoylea€“Lyttleton Accretion onto Superdisks

Hanamoto Keishi; Ioroi Masayuki; Fukue Jun

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Hoylea€“Lyttleton Accretion onto Superdisks

机译：Hoylea：“ Lyttleton在超级磁盘上的吸积”

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WeexamineHoylea€“Lyttletonaccretionontosuperdisks,wherethemass-accretionrategreatlyexceedsthecriticaloneandtheluminosityisoftheorderoftheEddingtonone.Hoylea€“Lyttletonaccretionontoaluminousaccretiondiskisdrasticallychangedfromthesphericalcase,duetothenon-sphericalnatureofdiskradiationfields.Inedge-onaccretion,forexample,massaccretiondoesnotceaseat$$Gamma=1$$,butcontinuesintheregimeof$$Gammageq1$$,where$$Gamma$$isthediskluminositynormalizedbytheEddingtonone.WefoundthatHoyle-Lyttletonaccretionontosuperdisksisnotasimpleextensionofthatontostandardaccretiondisks,wherethemass-accretionrategraduallydecreaseswithincreasing$$Gamma$$.Instead,inthecaseofasuperdisk,themass-accretionrateincreaseswithincreasing$$Gamma$$.Thisisduetoageometricalshadowingeffect.Thatis,incontrasttotheinfinitesimally-thinstandarddisk,thesuperdiskhasfinitethickness.As$$Gamma$$increases,therelativethicknessincreasesandtheshadowingregionintheequatorialdirectionincreases.Wealsobrieflydiscussthecanonicalluminosityinthesteadystateandthesystemevolution.

机译：WeexamineHoylea€“Lyttletonaccretionontosuperdisks，wherethemass-accretionrategreatlyexceedsthecriticaloneandtheluminosityisoftheorderoftheEddingtonone.Hoylea€“Lyttletonaccretionontoaluminousaccretiondiskisdrasticallychangedfromthesphericalcase，duetothenon-sphericalnatureofdiskradiationfields.Inedge-onaccretion，forexample，massaccretiondoesnotceaseat $$伽玛= 1 $$，butcontinuesintheregimeof $$ Gammageq1 $$，其中$$伽玛$$ isthediskluminositynormalizedbytheEddingtonone.WefoundthatHoyle- Lyttletonaccretionontosuperdisksisnotasimpleextensionofthatontostandardaccretiondisks，wherethemass-accretionrategraduallydecreaseswithincreasing $$伽玛$$。相反，inthecaseofasuperdisk，themass-accretionrateincreaseswithincreasing $$伽玛$$。Thisisduetoageometricalshadowingeffect.Thatis，incontrasttotheinfinitesimally-thinstandarddisk，thesuperdiskhasfinitethickness.As $$伽玛$$增加，therelativethicknessincreasesandtheshadowingregionintheequatorialdirectionincreases.Wealsobrieflydiscussthecanonicalluminosityinthesteadys时代与系统的演变。

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《PASJ: Publications of the Astronomical Society of Japan》 |2001年第1期|共页
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Hanamoto Keishi; Ioroi Masayuki; Fukue Jun;
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Hoylea€“Lyttleton Accretion onto Superdisks

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