Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 392
ween the period of the hght variation and theapparent magnitude of the star from which the period of anyCepheid variable in the Cloud could be deduced if its apparentmagnitude had been determined. In many stellar clusters occur variable stars which areusually termed cluster variables ; the… … + 1-8 -0-2 -0-6 Fig. 100.- +;-4 +7-0 +0-6 +0-2 Lo^ Period. -The Luminosity-period Relationship for Cepheid Variables. Shapley found that such variables in any one cluster con-formed to the same type of relationship connecting period andmagnitude as the variables in the Magellanic Cloud, and it…
Astronomy
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