Table 3: Simultaneous MORO solution of the UBV light curves of the eclipsing system IU Aur; for comparison, a previous solution is also presented in the third column.

Parameter		 this paper DHLM

Fixed parameters

A1 = A2a		 1.0 1.0
g1 = g2b 1.0 1.0
x1 ( U)$\ ^c$ 0.342 0.20
$x_1~(B)\ ^{c}$ 0.337 0.25
$x_1~(V)\ ^{c}$ 0.303 0.20
$x_2~(U)\ ^{c}$ 0.353 0.30
$x_2~(B)\ ^{c}$ 0.352 0.35
$x_2~(V)\ ^{c}$ 0.313 0.30
T1 (K) 32 000 32 000

Adjusted parameters

i		 $83\fdg7 \pm 0\fdg8$ $90\fdg0 \pm 0\fdg3$
  (epoch 1998.0) (epoch 1984.4)
q (=M2/M1) $0.672 \pm 0.017$ 0.691
T2 (K) $27~540 \pm 290$ 28 220
$\Omega_1$ $3.366 \pm 0.032$ 3.502
$\Omega_2$ $3.186 \pm 0.037$ 3.212
L1 (U)d $0.625 \pm 0.007$ 0.587
L1 (B) d $0.617 \pm 0.008$ 0.580
L1 (V) d $0.610 \pm 0.007$ 0.574
l3 (U)e 19.8% $\pm 1.8$% 16.9%
l3 (B) e 24.3% $\pm 1.6$% 20.8%
l3 (V) e 24.0% $\pm 1.7$% 21.1%
$\delta_1$f $0.010 \pm 0.004$ 0.012
$\delta_2^{\;~f}$ $0.002 \pm 0.002$ 0.001

Roche radii g

$r_1~({\rm pole})$		 $0.362 \pm 0.006$ 0.348
$r_1~({\rm side})$ $0.378 \pm 0.009$ 0.362
$r_1~({\rm back})$ $0.398 \pm 0.009$ 0.379
$r_1~({\rm point})$ $0.423 \pm 0.008$ 0.396
$r_2~({\rm pole})$ $0.324 \pm 0.003$ 0.327
$r_2~({\rm side})$ $0.339 \pm 0.004$ 0.343
$r_2~({\rm back})$ $0.371 \pm 0.005$ 0.376
$r_2~({\rm point})$ $0.425 \pm 0.014$ 0.435

$1\sigma$ deviation		 0.0074 0.0039
a Bolometric albedo.
b Gravitational darkening exponent.
c Linear limb darkening coefficient; theoretical values taken fromDíaz-Cordovés et al. (1995).
d Relative luminosities Li/(L1 + L2); L2 is not independently adjusted, but recomputed from r2 and T2.
e Fraction of third light at maximum.
f Radiation pressure parameter, see Drechsel et al. (1995).
g Fractional Roche radii in units of separation of mass centers.

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