Magnetic activity of the solar-like star HD 140538

Mittag, M.; Schmitt, J. H. M. M.; Metcalfe, T. S.; Hempelmann, A.; Schröder, K.-P.

doi:10.1051/0004-6361/201935654

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Magnetic activity of the solar-like star HD 140538

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Metcalfe, T. S.
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Mittag, M., Schmitt, J. H. M. M., Metcalfe, T. S., Hempelmann, A., & Schröder, K.-P. (2019). Magnetic activity of the solar-like star HD 140538. Astronomy and Astrophysics, 628: A107. doi:10.1051/0004-6361/201935654.

Cite as: https://hdl.handle.net/21.11116/0000-0005-EE46-1

Abstract

The periods of rotation and activity cycles are among the most important properties of the magnetic dynamo thought to be operating in late-type, main-sequence stars. In this paper, we present a SMWO-index time series composed from different data sources for the solar-like star HD 140538 and derive a period of 3.88 ± 0.02 yr for its activity cycle. Furthermore, we analyse the high-cadence, seasonal SMWO data taken with the TIGRE telescope and find a rotational period of 20.71 ± 0.32 days. In addition, we estimate the stellar age of HD 140538 as 3.7 Gyrs via a matching evolutionary track. This is slightly older than the ages obtained from gyrochronology based on the above rotation period, as well as the activity-age relation. These results, together with its stellar parameters that are very similar to a younger Sun, make HD 140538 a relevant case study for our understanding of solar activity and its evolution with time.