Paper:	A New Approach to the Solar Evolutionary Model with Helioseismic Constraints
Volume:	479, Progress in Physics of the Sun and Stars
Page:	3
Authors:	Ayukov, S. V.; Baturin, V. A.
Abstract:	The traditional procedure for modeling solar evolution is to perform a calibration. It is a process of adjusting the convection parameter α, and hydrogen initial abundance X0, to obtain a model with given radius and luminosity at a specified age. Helioseismology provides rather precise determinations of the solar convection boundary position Rcz, and helium content in the envelope Ycz. Modern standard models of the Sun have Rcz and Ycz close to the helioseismic values. However certain investigations connected with eigenfrequency analysis require solar models with exact values of Ycz and especially Rcz. This work proposes a method to calculate models with specified convection zone parameters. Target calibration values can be chosen from the set of Rcz, Ycz, Zcz and mass parameter M75 (mass coordinate at radius 0.75 R☉). The method is based on local and global opacity modifications. Global modification allows the calibration of Ycz, a local change in the radiative zone which mainly affects the specific entropy in the solar convection zone boundary Scz. Convection zone depth depends on Ycz, Zcz, M75 or can be independently adjusted via a local correction.

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