Multiple Choice
By what standard technique did astronomers in the 1930s originally determine the luminosity class (I, II, III, IV, or V) of a star?
A) combining the apparent magnitude with the measured distance to the star
B) observing the diameter of the star on a photographic plate or CCD image
C) timing how long it takes for the star to be eclipsed by a companion in an eclipsing binary star system
D) studying the absorption lines in the star's spectrum
Correct Answer:
Verified
Correct Answer:
Verified
Q202: Which of these sequences of stellar spectral
Q203: What observations of a star are necessary
Q204: What fraction of the stars surrounding the
Q205: Which important stellar parameter can be derived
Q206: The radial velocity curve of a star
Q208: Use the Hertzsprung-Russell diagram (Figure 12-7) and
Q209: An astronomer is observing a binary system
Q210: The chemical makeup of the Sun's surface
Q211: Which of these types of main-sequence stars
Q212: As one moves upward and to the