Question

An astronomer has been observing two Cepheid variable stars over the course of a month. Both variable stars have the exact same period of pulsation. Star A is twice as bright as Star B. Which of the following statements most accurately reflects the relationship between the astronomer (on Earth) and both Cepheid variable stars? Stars A and B have the same luminosity, but Star A is closer to Earth than Star B.Stars A and B have the same luminosity, but Star B is closer to Earth than Star A.Stars A and B are both the same distance from Earth, but the luminosity of Star A is greater than Star B

Answer 1

Answer:

The luminosity of both the stars is same star A is closer to the planet Earth as compared to star B.

Explanation:

From the mentioned case we can infer that the most accurate relation between the stars and the astronomer on earth observing for over a period is that the luminosity of the stars is same.

The more drawn out the pulsation time frame, the more brilliant the star. The period-luminosity connection for old style Cepheid was found in 1908 by Henrietta Swan Leavitt in an examination of thousands of different stars in the Magellanic Clouds.