Relativistic anisotropic charged fluid spheres with varying cosmological constant

Static spherically symmetric anisotropic source has been studied for the Einstein-Maxwell field equations assuming the erstwhile cosmological constant $\mathrm{\Lambda }$ to be a space-variable scalar, viz., $\mathrm{\Lambda }=\mathrm{\Lambda }(r)$. Two cases have been examined out of which one reduces to isotropic sphere. The solutions thus obtained are shown to be electromagnetic in origin as a particular case. It is also shown that the generally used pure charge condition, viz., $\rho +p_r=0$ is not always required for constructing electromagnetic mass models.