Abstract
IN the interesting review1 of the pulsation theory in his George Darwin Lecture of 1943 before the Royal Astronomical Society, Prof. S. Rosseland has indicated the importance of unharmonic oscillations in explaining the Cepheid characteristics, and brought out the effect of the amplitude in lengthening the pulsational period, pointed out by Kluyver2 in 1937, and imparting the characteristic skewness to the light and velocity curve.
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References
Rosseland, S., Mon. Not. Roy. Ast. Soc., 103, 233 (1943).
Kluyver, H. A., B.A.N., 7, 265 (1937).
Miller, J. C. P., Mon. Not. Roy. Ast. Soc., 90, 59 (1929).
Kopal, Z., Mon. Not. Roy. Ast. Soc., 99, 33 (1939).
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ROY, S. Amplitude Effect in Cepheid Variables. Nature 155, 24 (1945). https://doi.org/10.1038/155024b0
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DOI: https://doi.org/10.1038/155024b0
