THIS USER ASKED 👇

Which variable stars have pulsation periods between 1.5 hours and 1.2 days? a. cepheid variables b. protostars c. rr lyrae variables d. nebulas

THIS IS THE BEST ANSWER 👇

The choice of correct answers is:

C) Variables RR Lyrae

Explanation:

RR Lyrae variables are unsafe periodic stars, commonly found in spherical groups. They are taken as regular lights to measure galactic distances, as part of the infinite distance ladder. This class of solemn star is identified after the glorious prototype and specimen, RR Lyrae. R Lyraes are vibrating aging parallel stars in class A or F, with a mass of about half the Sun.