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Stellar structure codes (meaning computer programs calculating the model's variables) either interpolate in a density-temperature grid to obtain the opacity needed, or use a fitting function based on the tabulated values. A similar situation occurs for accurate calculations of the pressure equation of state.
The data include stellar parameters (such as positions, magnitudes, and temperatures), exoplanet parameters (such as masses and orbital parameters) and discovery/characterization data (such as published radial velocity curves, photometric light curves, images, and spectra).
Pages Related to Stellar properties, Pages using the word stellar in a physics context. ... Stellar spin-down; Stellar structure; Stellar surface fusion; Stellar system;
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core.
This stellar model, technically the spherically symmetric quasi-static model of a star, has stellar structure described by several differential equations derived from basic physical principles. The model is constrained by boundary conditions , namely the luminosity , radius, age and composition of the Sun, which are well determined.
This is a list of the largest cosmic structures so far discovered. The unit of measurement used is the light-year (distance traveled by light in one Julian year ; approximately 9.46 trillion kilometres ).
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Finally, by the virial theorem, the total kinetic energy is equal to half the gravitational potential energy E G, so if the average nuclei mass is m n, then the average kinetic energy per nucleus satisfies: = = where the temperature T is averaged over the star and C is a factor of order one related to the stellar structure and can be estimated ...
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