edu.ucar.opensky::articles:21227 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T16:06:59.338526 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7vh5rgb The influence of metallicity on stellar differential rotation and magnetic activity 2018-01-05T00:00:00Z publication https://n2t.org/ark:/85065/d7vh5rgb https://doi.org/10.3847/1538-4357/aaa026 Karoff, C. author Metcalfe, T. S. author Santos, Â. R. G. author Montet, B. T. author Isaacson, H. author Witzke, V. author Shapiro, A. I. author Mathur, S. author Davies, G. R. author Lund, M. N. author Garcia, R. A. author Brun, A. S. author Salabert, D. author Avelino, P. P. author Saders, J. v. author Egeland, Ricky author Cunha, M. S. author Campante, T. L. author Chaplin, W. J. author Krivova, N. author Solanki, S. K. author Stritzinger, M. author Knudsen, M. F. author UCAR/NCAR - Library publisher Observations of Sun-like stars over the past half-century have improved our understanding of how magnetic dynamos, like that responsible for the 11 yr solar cycle, change with rotation, mass, and age. Here we show for the first time how metallicity can affect a stellar dynamo. Using the most complete set of observations of a stellar cycle ever obtained for a Sun-like star, we show how the solar analog HD 173701 exhibits solar-like differential rotation and a 7.4 yr activity cycle. While the duration of the cycle is comparable to that generated by the solar dynamo, the amplitude of the brightness variability is substantially stronger. The only significant difference between HD 173701 and the Sun is its metallicity, which is twice the solar value. Therefore, this provides a unique opportunity to study the effect of the higher metallicity on the dynamo acting in this star and to obtain a comprehensive understanding of the physical mechanisms responsible for the observed photometric variability. The observations can be explained by the higher metallicity of the star, which is predicted to foster a deeper outer convection zone and a higher facular contrast, resulting in stronger variability. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2018 American Astronomical Society. None eng geoscientificInformation