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  From solar to stellar brightness variations: The effect of metallicity

Witzke, V., Shapiro, A., Solanki, S. K., Krivova, N. A., & Schmutz, W. (2018). From solar to stellar brightness variations: The effect of metallicity. Astronomy and Astrophysics, 619: A146. doi:10.1051/0004-6361/201833936.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-C3A4-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-B396-8
Genre: Journal Article

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 Creators:
Witzke, Veronika1, Author              
Shapiro, Alexander1, 2, Author              
Solanki, Sami K.1, Author              
Krivova, Natalie A.1, Author              
Schmutz, W., 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: variables: general / stars: activity / stars: atmospheres / stars: fundamental parameters / radiative transfer
 Abstract: Context. Comparison studies of Sun-like stars with the Sun suggest an anomalously low photometric variability of the Sun compared to Sun-like stars with similar magnetic activity. Comprehensive understanding of stellar variability is needed to find a physical reason for this observation. Aims. We investigate the effect of metallicity and effective temperature on the photometric brightness change of Sun-like stars seen at different inclinations. The considered range of fundamental stellar parameters is sufficiently small so the stars investigated here still count as Sun-like or even as solar twins. Methods. To model the brightness change of stars with solar magnetic activity, we extended a well-established model of solar brightness variations based on solar spectra, Spectral And Total Irradiance REconstruction (SATIRE), to stars with different fundamental parameters. For this we calculated stellar spectra for different metallicities and effective temperature using the radiative transfer code ATLAS9. Results. We show that even a small change (e.g. within the observational error range) of metallicity or effective temperature significantly affects the photometric brightness change compared to the Sun. We find that for Sun-like stars, the amplitude of the brightness variations obtained for Strömgren (b + y)/2 reaches a local minimum for fundamental stellar parameters close to the solar metallicity and effective temperature. Moreover, our results show that the effect of inclination decreases for metallicity values greater than the solar metallicity. Overall, we find that an exact determination of fundamental stellar parameters is crucially important for understanding stellar brightness changes.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201833936
 Degree: -

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Project name : ERC-2016-STG - SOLVe
Grant ID : 715947
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 619 Sequence Number: A146 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1