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..,



( Clarke et al., 2005, MNRAS 361, 942 )


:

· ? · ?




Magnetospheric model (Bertout et al., 1988)

Romanova et al., 2003, ApJ 595, 1009


Disk accretion to inclined magnetic dipol
( Romanova et al., 2003, ApJ 595, 1009 )


Boundary layer accretion model (Lynden-Bell & Pringle, 1974 + ...) dM/dt ~ 10 - 4 Mo/yr

Lac=GM/r dM/dt >> L LdiskLBL 0.5Lac
Axial symmetry !

*


Spectrum of FU Ori in the vicinity of H line

(dM/dt)

wind

~ 0.1 (dM/dt)

ac

F/F

c




Best fit of the HST/STIS UV spectrum of FU Ori observed in 2000 ( Kravtsova et al., 2007, Astron. Letters 33, 755)

T1 5000-6000 K, S1/S 95 % ; T2 9000 K, + cold neutral wind: T 5000 K, lg N 11.0 ;

S2/S 5 %


"Compromise" model of FUORs
Thick advective disk at dM/dt > 10-5 M/yr ( Kley & Lin, 1996, ApJ 461, 933 )

Two component X-ray spectrum of FU Ori: A: kT1 0.7 keV, lg NH 21.6 B: kT2 6-7 keV, lg NH 23 ( Skinner et al., 2006, ApJ 643, 995 )


Variations of H_ profile in the spectrum of FU Ori
(Errico et al., 2003, Astron. Letters 29, 125)


Some examples of H profiles in FU Ori spectrum



2005


Variations of H line's absorption component EW in spectra of FU Ori in 2000 and 2005 yr.



Inclined rotator model
V1057 Cyg


FU Ori



FU Ori


The origin of shell components

Clarke et al., 2005, MNRAS 361, 942

Herbig et al., 2003, ApJ 595, 384



(Lin & Papaloizou 1985; Clarke et al. 1990), . (Bell & Lin 1994; Bell et al. 1995). , , , , . Lodato & Clarke (2004) , .


Close encounter of protostars in a binary system,
resulting in tidal effects in the disks and increasing of mass transfer ( Bonnell & Bastien, 1992, ApJ, 401, L31 )



DF Tau historic light curve ( Lamzin et al., 2001, A&A 372, 922 )


DF Tau outburst
Li et al., 2001, ApJ 549, L89

8
10 12 14


R




B

V








Moving IR spot of FU Ori (Malbet et al., 2005, A&A 437,627)
Disk+Spot

Disk dR/dt 1.2 ± 0.6 a.u./yr

A companion on an extremely eccentric orbit ?


Gravitational instability in the disk
Vorobyov & Basu, 2006, ApJ 650, 956

Kenyon et al., 2000, ApJ, 531, 1028

V 0.035 ± 0.005 mag