**Category:**

Historical Papers

**Sub-Category:**

Astrophysics

**Date Published:**

April 1931

**Keywords:**

ballistic theory, Ritz, Salat, Miss Leavitt, Jeans, Eddington, Doppler effect, variable stars, Algol, Einstein, moving source, Cepheides

**Filename:**

LaRosa_MemAstronItal[trans]_v5n3(1931)303-314.pdf

**Publication:**

Memorie della Società Astronomica Italiana[trans]

**Comments:**

translation using Google Translator by Thomas E Miles

**Abstract:**

ABSTRACT - The hypothesis of the influence of the motion of the source on the speed of the light (ballistic hypothesis) has already led the author to give a general explanation of the fundamental phenomena of the “variables”.
The author now proposes in this article to examine if from the theoretical schema already elaborated, he can deduct Miss LEAVITT’s law, which gives & relation between the absolute stellar magnitude and the period of the Cepheids of the same star cluster. He, therefore, explains some theorems that express the conditions necessary so that the doubles contained in a cluster can appear as variables, and deducts a general relation between the sum of the masses of the two stars of the double and the period of the change of light.
In order then, to be able to bind this period to the stellar magnitude, the author examines the condition of the EDDINGTON and JEANS researches relative to the relation between the mass and the luminosity of the stars, & and so transporting the EDDINGTON formula, or that more correct one of JEANS into the preceding relation between mass and period, he arrives at Miss LEAVITT'S law, which in such a way, tarnishes a new and strong proof in favor of the basic explanation of the variables and of its fundamental hypothesis (influence of the motion of the source on the speed of the light).

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