Abstract
We present a study that probes the evolution of the molecular gas, dust and morphology of evolved circumstellar envelopes. Our primary objective in this study is to obtain a better understanding of the intertwining relationships between the morphological and chemical evolution of evolved stars through interferometric observations in the radio and near-infrared (NIR) regime. We propose to 1) investigate the morphology of objects via radio continuum observations using the Extended Very Large Array (EVLA) interferometer, 2) construct three-dimensional models that are self consistent with both interferometric and spectroscopic observations, 3) investigate how properties of circumstellar dust affects an objects on different color diagrams, and 4) continue to perform spectral line surveys to study the chemistry in circumstellar envelopes (CSEs).