cepheid distance 中文意思是什麼
cepheid distance
解釋
造父距離-
We have to use some other methods to measure the luminosity or equivalently the absolute magnitude of the cepheid variable. since we can readily measure the apparent magnitude of a cepheid variable, to measure the luminosity means measuring the distance. we use some distance measurement methods, for example, parallax, to determine the relation
要弄清這個關系，我們要知道不同造父變星的光度和光變周期數據，量度光變周期當然不是問題，但要得知一顆恆星的光度，我們首先要得知它的距離，這時便須藉助好像視差法等其他量度天體距離的方法。
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