Which of the following statements about Cepheid variable stars are correct?
A、Cepheid variable stars, also known as long-period Cepheid variable stars or classic Cepheid variable stars, are a type of pulsating variable star.;
B、The brightness of such variable stars changes periodically.;
C、The luminosity of such variable stars varies between 0.1 and 2.0.;
D、According to a large number of studies on Cepheid variable stars, the longer the period of Cepheid variable stars, the smaller the average luminosity.;
E、Cepheid variable stars are often hailed as "gauges".
发布时间:2024-06-01 20:57:02