Spectroscopic binaries are difficult to analyze 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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Q2: In the H-R diagram, 90 percent of
Q3: Red giant stars are
I. more luminous than
Q5: The _ of a star is a
Q5: The star named Sheat is of M2
Q7: Parallax would be easier to measure if
A)
Q8: Use the HR diagram below to answer
Q10: Use the HR diagram below to answer
Q11: In a binary system, the more massive
Q11: Compared with the spectral lines in the
Q15: We know that giant stars are larger
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