What properties of Cepheid variable stars are most often measured to determine their distance?
A) luminosity and brightness
B) period and brightness
C) luminosity and temperature
D) period and temperature

Question

Quizplus · Accepted Answer

The period and brightness of Cepheid variable stars are most often measured to determine their distance. The period-luminosity relationship of Cepheids allows astronomers to calculate their intrinsic luminosity, which can then be compared with their apparent brightness to determine their distance.

What Properties of Cepheid Variable Stars Are Most Often Measured