Volume 628, August 2019
|Number of page(s)||6|
|Published online||14 August 2019|
Magnetic activity of the solar-like star HD 140538
Hamburger Sternwarte, Universität Hamburg,
2 Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA
3 Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany
4 Department of Astronomy, University of Guanajuato, Guanajuato, Mexico
5 Sterrewacht Leiden, University of Leiden, Leiden, The Netherlands
Accepted: 28 June 2019
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.
Key words: stars: atmospheres / stars: activity / stars: chromospheres / stars: late-type / stars: individual: HD 140538 / stars: rotation
© ESO 2019
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.