Which of these possible factors MOST seriously limits the accuracy of spectroscopic parallax?
A) Stars of the same spectral luminosity class can have a range of temperatures.
B) It is difficult to accurately measure angular displacement for distant stars.
C) Stars of the same spectral luminosity class can have a range of absolute magnitudes.
D) It is not possible to accurately classify the spectral luminosity of even a nearby star.

Question

Quizplus · Accepted Answer

Stars of the same spectral luminosity class can indeed have a range of absolute magnitudes, which introduces significant uncertainty in determining their distances using spectroscopic parallax. This method relies on the assumption that stars within the same spectral class have roughly the same intrinsic brightness, but the variation in absolute magnitudes among these stars can lead to inaccuracies in distance measurements.

Which of These Possible Factors MOST Seriously Limits the Accuracy