Question

Where are the cepheid variables? Can we see any from earth without a telescope?

Answer 1

Cepheid variables are particular type of star used as standard candle to measure distances of stars.

Explanation:

Delta star in the constellation of Cepheus is the first star found out in this type, Its magnitude varies from 3.48 to 4.37
It is a naked eye object. \
Drawing from wikipedia cephid variables.