Question

use the diagram to answer the question.
hertzsprung-russell diagram
which piece of spectral data is necessary to determine the spectral class of a star?
(1 point)
options: luminosity, temperature, apparent magnitude, absolute magnitude

Explanation:

Spectral classes (O, B, A, F, G, K, M) are directly tied to a star's surface temperature, as shown on the x-axis of the Hertzsprung-Russell Diagram. Luminosity, apparent magnitude, and absolute magnitude relate to brightness/luminosity, not the spectral class grouping.

Answer:

temperature