The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because
A) we can't measure the radial velocities of each star in the system.
B) we can't see the shape or tilt of the orbit.
C) we can't find the diameters of the stars.
D) we can't determine the luminosities of the stars.
E) the Doppler shift is not measurable.
Correct Answer:
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A)be more luminous than
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I.more luminous than the
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