These are important because they produce regular pulses of light and the period of those pulses is precisely related to the luminosity of the star.
其之所以重要是因为它们发出有规律的光脉冲，而且这些脉冲的周期与该星的亮度精确对应。
A type of variable star whose period of variation is tightly related to its intrinsic luminosity.
变星的一种，它的固有光度和它的光变周期有着紧密的联系。
A type of variable star whose period of variation is tightly related to its intrinsic luminosity.
变星的一种，它的固有光度和它的光变周期有着紧密的联系。
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