What are the two most important intrinsic properties used to classify stars?

Question

Quizplus · Accepted Answer

Luminosity and surface temperature are the two most important intrinsic properties used to classify stars. Luminosity is a measure of a star's total energy output and surface temperature is a measure of the star's color and spectral type. Together, these properties allow astronomers to place stars on the Hertzsprung-Russell (HR) diagram, which is a fundamental tool for understanding stellar evolution. Mass and age are also important properties, but these are more difficult to measure accurately and require additional information. Distance and color are extrinsic properties that are used to study the distribution and properties of stars in different regions of the galaxy.

What Are the Two Most Important Intrinsic Properties Used to Classify