A Note on Bimodal Accretion Disks | Zendy

C. P. Dullemond | Zendy; R. Turolla | Zendy

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A Note on Bimodal Accretion Disks

Author(s) -

C. P. Dullemond,

R. Turolla

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/305973

Subject(s) - accretion (finance) , physics , accretion disc , advection , radius , astrophysics , flux (metallurgy) , argument (complex analysis) , computer science , thermodynamics , materials science , computer security , metallurgy , biochemistry , chemistry

The existence of bimodal disks is investigated. Following a simple argumentbased on energetic considerations we show that stationary, bimodal accretiondisk models in which a Shakura--Sunyaev disk (SSD) at large radii matches anadvection dominated accretion flow (ADAF) at smaller radii are never possibleusing the standard slim disk approach, unless some extra energy flux ispresent. The same argument, however, predicts the possibility of a transitionfrom an outer Shapiro--Lightman--Eardley (SLE) disk to an ADAF, and from a SLEdisk to a SSD. Both types of solutions have been found.Comment: 9 pages including 9 figures, accepted for publication in The Astrophysical Journa

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