Hubble was able to resolve six variable stars in M31.
哈勃望远镜能

西叶星云星团表31中
六颗变星。
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Cepheid variables are reasonably easy to recognize because they are among the brightest variable stars, and they have a characteristic light curve, showing fairly rapid increases in brightness followed by a slower tailing off.
造父变星相当容易识别, 因为它们是亮度
高的变星之
,并且具有典型的光变曲线,显示出亮度相当迅速的增加, 随后是较为缓慢的减弱过程。