Which possible factor 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

Spectroscopic parallax relies on comparing the observed spectrum of a star to a known spectrum of a star of the same spectral class and luminosity. However, stars of the same spectral luminosity class can have a range of absolute magnitudes due to differences in distance and variability. This can significantly affect the accuracy of spectroscopic parallax, especially for distant stars.

Which Possible Factor MOST Seriously Limits the Accuracy of Spectroscopic