What is spectroscopic parallax?
A) apparent change in position of the absorption lines in a star's spectrum due to the Doppler shift caused by Earth's motion around the Sun
B) apparent change in position of a nearby star compared with distant background stars due to the motion of Earth around the Sun
C) change in position of the absorption lines in a star's spectrum due to the Doppler shift caused by the star's motion around the center of mass in a binary star system
D) distance to a star measured using the spectral luminosity class of the star and the inverse-square law

Question

Quizplus · Accepted Answer

Spectroscopic parallax involves determining the distance to a star by using its spectral type and luminosity class, along with the inverse-square law for light, to estimate its absolute magnitude and, consequently, its distance from Earth.

What Is Spectroscopic Parallax