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About

A. Hempelmann is an observational astronomer whose research centers on stellar activity, chromospheric variability, and the development of robotic spectroscopic instrumentation. A central figure in the design and deployment of automated telescope systems, Hempelmann has made significant contributions to the infrastructure of modern stellar astrophysics, most notably through involvement in the TIGRE facility — a 1.2-meter robotic telescope at La Luz Observatory in Guanajuato, Mexico, coupled to a high-resolution échelle spectrograph. This instrument, described in his most-cited work (96 citations), has become a key tool for long-term stellar monitoring campaigns. Hempelmann has also contributed to earlier robotic systems, including the Hamburg Robotic Telescope and the STELLA project, advancing automated data reduction pipelines and precision pointing models. Scientifically, his work spans stellar cycle detection — including a notable four-month chromospheric and coronal activity cycle in τ Boötis (32 citations) — solar chromospheric monitoring, and binary star dynamics. His research bridges instrumentation innovation with stellar physics, providing the community with both the tools and data necessary to understand magnetic activity cycles across solar-type stars. Collectively, his publications reflect a sustained commitment to high-resolution spectroscopy and long-baseline observational campaigns.