Abstract
THE most important objection raised against the pulsation theory of Cepheid variation lies in its failure to explain the observed phase relation between temperature and radial velocity. In a pulsating star it would appear that maximum temperature and luminosity should coincide in phase with minimum radius. Actually, however, observations of radial velocity show that at maximum light the stellar atmosphere possesses its greatest velocity of approach towards the observer. Eddington has shown that this phase-displacement cannot be explained as due to a lag of energy-flow introduced in the upper, non-adiabatic, layers of the star.
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References
Seares and Shapley, Astrophys. J., 48, 214; 1918.
Milne, Mon. Not. Roy. Astro. Soc., 94, 418; 1934.
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BLEKSLEY, A. Relation between Temperature and Radius in the Cepheid Variables. Nature 134, 661 (1934). https://doi.org/10.1038/134661a0
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DOI: https://doi.org/10.1038/134661a0
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