Speaker
Description
High-resolution interferometric observations have revealed a variety of spiral-shell structures in the circumstellar envelopes of evolved stars, likely linked to binary interaction and asymmetric mass loss. Interpreting the three-dimensional geometry of these expanding structures from position-position-velocity data, however, remains challenging due to projection effects and structural complexity. We present an ongoing effort to develop a tracing framework for identifying coherent spiral features by combining spatial and kinematic information in interferometric data cubes. The goal of this approach is to move beyond qualitative two-dimensional channel-map inspection toward a more systematic characterization of circumstellar spiral structures. In this contribution, we discuss the current status of the methodology, its limitations, and possible future applications to evolved-star systems exhibiting complex envelope morphologies. Such approaches may provide a useful basis for future comparisons with hydrodynamical models and for investigating the role of binary interaction in shaping circumstellar environments.