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The Theory of Cepheid Variability

Christy, Robert F. (1968) The Theory of Cepheid Variability. Quarterly Journal of the Royal Astronomical Society, 9 (1). pp. 13-39. ISSN 0035-8738.

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<p>It is now just 50 years since Eddington's first paper on Cepheid pulsation (1). He recognized immediately the central problem of the maintenance of pulsation and proceeded to develop (2) the linear theory leading to the period-density relation. He continued to devote considerable attention (3) to understanding the physical mechanisms responsible for exciting pulsation and recognized all of the essential aspects of that problem.</p> <p>His point of view on pulsation was expressed in Stars and Atoms: 'to be able to see the machinery of a star throbbing with activity is most instructive for the development of our knowledge'. This view constitutes the theme of the work I will discuss here on the application of non-linear methods to the Cepheid variables.</p> <p>The discussion will be divided into three main parts, of which the first will be devoted to the methods of investigation. The second part will be aimed at understanding the physical causes of pulsation and the mechanism of amplitude limitation. The third part will discuss the various results of pulsation calculations. The objective of this part will be to find ways by which all the significant physical parameters (mass M, mean effective temperature T<sub>e05</sub>, mean luminosity L<sub>05</sub>, and helium mass fraction Y) that control pulsation can be deduced from observation of the variable star.</p>

Item Type:Article
Additional Information:© Royal Astronomical Society. George Darwin Lecture, delivered at Burlington House on 1967 September 8. This work has been supported in part by the Office of Naval Research Contract [Nonr-220(47)] and the National Aeronautics and Space Administration grant [NsG-426].
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U.S. Office of Naval ResearchNonr-220(47)]
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34725
Deposited By: Katherine Johnson
Deposited On:05 Oct 2012 23:13
Last Modified:03 Oct 2019 04:21

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