Starspot Activity and Rotation of SZ Piscium: A Doppler Imaging Study

This study examines the magnetic activity and rotation of SZ Piscium, a binary star system, using Doppler imaging to map starspots on the surface of its K-type subgiant star. The researchers observed widespread starspots, including a stable polar spot, and measured the star's differential rotation, finding that its equator rotates faster than its poles. They also confirmed the presence of a third companion star in the system, orbiting with a period of 1530 days.