Inhomogeneous Stellar Models. V. a. Solar Model with Convective Envelope and Inhomogeneous Interior.

A model for the sun has computed in which account has been taken both of the deep hydrogen convection zone and of the internal inhomogeneity in composition caused by the transmutation of hydrogen during the last five billion years. The model is found to permit good agreement with the analysis of the solar photosphere as regards chemical composition and as regards the depth of the hydrogen convection zone. Furthermore, the model indicates that the sun must have become brighter by nearly 2 mag. during the five billion years.