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  Inflection point in the power spectrum of stellar brightness variations: III. Facular versus spot dominance on stars with known rotation periods

Amazo-Gomez, E., Shapiro, A., Solanki, S. K., Kopp, G., Oshagh, M., Reinhold, T., et al. (2020). Inflection point in the power spectrum of stellar brightness variations: III. Facular versus spot dominance on stars with known rotation periods. Astronomy and Astrophysics, 642: A225. doi:10.1051/0004-6361/202038926.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-709E-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-709F-8
Genre: Journal Article

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 Creators:
Amazo-Gomez, Eliana1, Author              
Shapiro, Alexander1, Author              
Solanki, Sami K.1, Author              
Kopp, G., Author
Oshagh, M., Author
Reinhold, Timo2, Author              
Reiners, A., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society, ou_3164811              

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Free keywords: stars: rotation / stars: solar-type / methods: observational / techniques: photometric
 Abstract: Context. Stellar rotation periods can be determined by observing brightness variations caused by active magnetic regions transiting visible stellar disk as the star rotates. Successful stellar photometric surveys stemming from the Kepler and TESS observations have led to the determination of rotation periods in tens of thousands of young and active stars. However, there is still a lack of information on the rotation periods of older and less active stars like the Sun. The irregular temporal profiles of light curves caused by the decay times of active regions, which are comparable to, or even shorter than, stellar rotation periods, in combination with the random emergence of active regions make period determination for such stars very difficult. Aims. We tested the performance of a new method for the determination of stellar rotation periods against stars with previously determined rotation periods. The method is based on calculating the gradient of the power spectrum (GPS) and identifying the position of the inflection point (i.e. point with the highest gradient). The GPS method is specifically aimed at determining rotation periods of low-activity stars like the Sun. Methods. We applied the GPS method to 1047 Sun-like stars observed by the Kepler telescope. We considered two stellar samples individually: one with near-solar rotation periods (24–27.4 d) and a broad range of effective temperatures (5000–6000 K) and the other with near-solar effective temperatures (5700–5900 K) and a broad range of rotation periods (15–40 d). Results. We show that the GPS method returns precise values for stellar rotation periods. Furthermore, it allows us to constrain the ratio between facular and spot areas of active regions at the moment of their emergence. We also show that the relative facular area decreases with the stellar rotation rate. Conclusions. Our results suggest that the GPS method can be successfully applied to retrieve the periods of stars with both regular and non-regular light curves.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/202038926
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 642 Sequence Number: A225 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1