Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 479, Issue 4, Pages 5266-5271Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1717
Keywords
techniques: polarimetric; stars: activity; stars: individual: (tau Boo); stars: magnetic field; stars: solar-type; starspots
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Funding
- German Science Foundation (DFG) [FOR2544, JE 701/3-1]
- European Research Council (ERC) under the European Union [682393 AWESoMeStars]
- STFC [ST/M001296/1] Funding Source: UKRI
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One of the aims of the BCool programme is to search for cycles in other stars and to understand how similar they are to the Sun. In this paper, we aim to monitor the evolution of tau Boo's large-scale magnetic field using high-cadence observations covering its chromospheric activity maximum. For the first time, we detect a polarity switch that is in phase with tau Boo's 120-day chromospheric activity maximum and its inferred X-ray activity cycle maximum. This means that t Boo has a very fast magnetic cycle of only 240 days. At activity maximum tau Boo's large-scale field geometry is very similar to the Sun at activity maximum: it is complex and there is a weak dipolar component. In contrast, we also see the emergence of a strong toroidal component which has not been observed on the Sun, and a potentially overlapping butterfly pattern where the next cycle begins before the previous one has finished.
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