noun
Cepheid variable
A type of pulsating variable star used as a standard candle in astronomy. The term is a direct loan from English 'Cepheid' plus 変光星 (variable star).
See also: ケフェウス型変光星
ケフェイド変光星の周期と光度の関係は、宇宙の距離を測るのに使われる。
The period-luminosity relation of Cepheid variables is used to measure distances in the universe.
From English 'Cepheid' (after the constellation Cepheus) + 変光星 (variable star).