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Journal Article

Effect of metallicity on the detectability of rotational periods in solar-like stars

MPS-Authors
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Witzke,  Veronika
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Reinhold,  Timo
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Shapiro,  Alexander
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society;

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Krivova,  Natalie A.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Solanki,  Sami K.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Witzke, V., Reinhold, T., Shapiro, A., Krivova, N. A., & Solanki, S. K. (2020). Effect of metallicity on the detectability of rotational periods in solar-like stars. Astronomy and Astrophysics, 634: L9. doi:10.1051/0004-6361/201936608.


Cite as: http://hdl.handle.net/21.11116/0000-0006-539C-D
Abstract
The accurate determination of stellar rotation periods is important for estimating stellar ages and for understanding stellar activity and evolution. While rotation periods can be determined for about thirty thousand stars in the Kepler field, there are over one hundred thousand stars, especially with low photometric variability and irregular pattern of variations, for which rotational periods are unknown. Here we investigate the effect of metallicity on the detectability of rotation periods. This is done by synthesising light curves of hypothetical stars that are identical to our Sun with the exception of the metallicity. These light curves are then used as an input to the period determination algorithms. We find that the success rate for recovering the rotation signal has a minimum close to the solar metallicity value. This can be explained by the compensation effect of facular and spot contributions. In addition, selecting solar-like stars with near-solar effective temperature and photometric variability, and with metallicity between M/H = −0.35 and M/H = 0.35 from the Kepler sample, we analyse the fraction of stars for which rotational periods have been detected as a function of metallicity. In agreement with our theoretical estimate we find a local minimum for the detection fraction close to the solar metallicity. We further report rotation periods of 87 solar-like Kepler stars for the first time.