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velocity curve for a double line
spectroscopic binary is shown in the sketch.
The system is viewed edge-on, i.e., with an
inclination angle of i 90°, so that the
maximum possible Doppler shifts for this
system are observed.
400
SPo
= , Ain i
300
200
l0o = v Ain i
100
-100
-200
-300
400
0 1 2 3 4
10
Time (days)
Find the speed of star 2 in km/s.
Doppler Velocity
(2esu)

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