**Authors:** Nirod K. Das

The Unified Electro-Gravity (UEG) theory is applied to model gravitational effects of an individual star or a binary-star system, including that of the sun which is the only star of our solar system. The basic UEG theory was originally developed to model elementary particles, as a substitute for the standard model of particle physics. The UEG theory is extended in this paper (a) to model the gravitational force due to light radiation from an individual star, which determines its energy output due to nuclear fusion in the star, as well as (b) to model the gravitational force between two nearby stars, which determines the orbital dynamics in a binary-star system. The mass-luminosity relation (MLR) derived separately from each of the above two models are compared and studied together with the MLR currently available from measured orbital data for binary stars, as well as from an existing energy-source model for stellar nuclear fusion (Eddington's model). The current MLR data uses conventional Newtonian gravity, where the gravitational force is produced only due to the gravitational mass of the star, which is assumed to be equal to the inertial mass as per the principle of equivalence. This Newtonian gravitational model is modified by including the new UEG effect due to the light radiation of a star, in order to establish the actual MLR which can be significantly different from the currently available MLR. The new UEG theory is applied to an individual isolated star (for modeling the force for stellar nuclear fusion), which is spherically symmetric about its own center, in a fundamentally different manner from its application to a binary-star system (for modeling orbital motion of a binary-star), which is not a spherically-symmetric structure.

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[v1] 2019-07-02 03:14:34

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