-Refer to the figure. A Type I Cepheid with a period of 20 days has been located in a distant globular cluster. What is its absolute magnitude?

Question

Quizplus · Accepted Answer

Type I Cepheids have a well-established period-luminosity relationship, where a longer period indicates a brighter star. A Type I Cepheid with a period of 20 days typically has an absolute magnitude of about -5, making it a very luminous star.

-Refer to the Figure