Question

which is not a step in finding a stars distance using spectroscopic parallax? measure the stars apparent magnitude confirm that the star is on the main sequence measure the apparent shift in position of the star against more distant background stars use the h - r diagram to find the stars intrinsic luminosity

Explanation:

In spectroscopic parallax, we measure a star's apparent magnitude, confirm it's on the main - sequence, and use the H - R diagram to find its intrinsic luminosity. Measuring the apparent shift in position of a star against more distant background stars is a method for trigonometric parallax, not spectroscopic parallax.

Answer:

measure the apparent shift in position of the star against more distant background stars