Peering into the Starspots: The First Doppler Image of λ Andromedae
Researchers produced the first Doppler image of λ Andromedae, revealing four large starspots and refining its orbital parameters with high precision. By correcting radial velocity signals caused by these spots, they confirmed the star’s nearly circular orbit and identified its companion as a likely brown dwarf. This study improves our understanding of magnetic activity in evolved stars and its impact on orbital measurements.
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.