Exercice 1 : (5 points) Détection de naines brunes. Exercice 2 : (4

T?R?
TbRb
f
T
Fb/F?
T?= 5000K R?= 0.8RTb= 1250K Rb= 0.1R
s
d D
λ
s d = 15 D= 2 λ= 0.8µ3.08 1013 1.49 108
m
m1m2
B−V B1, V1, B2, V2
V B −V
V B −V

νGν0= 1.4204054
c= 3 108
νG
10−26 −2
k= 1.38 10−23
V V = 20
V= 0 −1.s−1.cm−2
V