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A binary system in the S cluster close to the supermassive black hole Sagittarius A*

Eckart, Andreas; Zajaček, Michal; Labadie, Lucas +4 more

High-velocity stars and peculiar G objects orbit the central supermassive black hole (SMBH) Sagittarius A* (Sgr A*). Together, the G objects and high-velocity stars constitute the S cluster. In contrast with theoretical predictions, no binary system near Sgr A* has been identified. Here, we report the detection of a spectroscopic binary system in …

Long-term Doppler imaging of the star XX Trianguli indicates chaotic non-periodic dynamo

Strassmeier, K. G.; Weber, M.; Granzer, T. +1 more

Sunspots are the most well-known manifestations of solar magnetic fields and exhibit a range of phenomena related to the interior dynamo. Starspots are the direct analogs of sunspots on other stars but with the big observational restriction that we usually cannot resolve other star's surfaces. In this paper we employ an indirect surface imaging te…