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dc.contributor.authorShapiro, A. I.-
dc.contributor.authorSolanki, S. K.-
dc.contributor.authorKrivova, N. A.-
dc.contributor.authorSchmutz, W. K.-
dc.contributor.authorBall, W. T.-
dc.contributor.authorKnaack, Reto-
dc.contributor.authorRozanov, E. V.-
dc.contributor.authorUnruh, Y. C.-
dc.date.accessioned2018-11-27T17:28:24Z-
dc.date.available2018-11-27T17:28:24Z-
dc.date.issued2014-06-10-
dc.identifier.issn0004-6361de_CH
dc.identifier.issn1432-0746de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/13289-
dc.description.abstractContext: The Sun and stars with low magnetic activity levels become photometrically brighter when their activity increases. Magnetically more active stars display the opposite behavior and become fainter when their activity increases. Aims: We reproduce the observed photometric trends in stellar variations with a model thattreats stars as hypothetical suns with coverage by magnetic features different from that of the Sun. Methods: The model attributes the variability of stellar spectra to the imbalance between the contributions from different components of the solar atmosphere, such as dark starspots and bright faculae. A stellar spectrum is calculated from spectra of the individual components by weighting them with corresponding disk-area coverages. The latter are obtained by extrapolating the solar dependences of spot and facular disk-area coverages on chromospheric activity to stars with different levels of mean chromospheric activity. Results: We find that the contribution by starspots to the variability increases faster with chromospheric activity than the facular contribution. This causes the transition from faculae-dominated variability and direct activity-brightness correlation to spot-dominated variability and inverse activity-brightness correlation with increasing chromospheric activity level. We show that the regime of the variability also depends on the angle between the stellar rotation axis and the line-of-sight and on the latitudinal distribution of active regions on the stellar surface. Our model can be used as a tool for extrapolating the observed photometric variability of the Sun to Sun-like stars at different activity levels, which makes a direct comparison between solar and stellar irradiance data possible.de_CH
dc.language.isoende_CH
dc.publisherEDP Sciencesde_CH
dc.relation.ispartofAstronomy & Astrophysicsde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectAstro-ph.SRde_CH
dc.subjectSun: activityde_CH
dc.subjectStars: activityde_CH
dc.subjectStars: solar-typede_CH
dc.subjectStars: variables: generalde_CH
dc.subjectSolar-terrestrial relationsde_CH
dc.subjectSun: atmospherede_CH
dc.subject.ddc500: Naturwissenschaftende_CH
dc.titleThe variability of Sun-like stars : reproducing observed photometric trendsde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Computational Physics (ICP)de_CH
dc.identifier.doi10.1051/0004-6361/201323086de_CH
zhaw.funding.euNode_CH
zhaw.issueA38de_CH
zhaw.originated.zhawYesde_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume569de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
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Shapiro, A. I., Solanki, S. K., Krivova, N. A., Schmutz, W. K., Ball, W. T., Knaack, R., Rozanov, E. V., & Unruh, Y. C. (2014). The variability of Sun-like stars : reproducing observed photometric trends. Astronomy & Astrophysics, 569(A38). https://doi.org/10.1051/0004-6361/201323086
Shapiro, A.I. et al. (2014) ‘The variability of Sun-like stars : reproducing observed photometric trends’, Astronomy & Astrophysics, 569(A38). Available at: https://doi.org/10.1051/0004-6361/201323086.
A. I. Shapiro et al., “The variability of Sun-like stars : reproducing observed photometric trends,” Astronomy & Astrophysics, vol. 569, no. A38, Jun. 2014, doi: 10.1051/0004-6361/201323086.
SHAPIRO, A. I., S. K. SOLANKI, N. A. KRIVOVA, W. K. SCHMUTZ, W. T. BALL, Reto KNAACK, E. V. ROZANOV und Y. C. UNRUH, 2014. The variability of Sun-like stars : reproducing observed photometric trends. Astronomy & Astrophysics. 10 Juni 2014. Bd. 569, Nr. A38. DOI 10.1051/0004-6361/201323086
Shapiro, A. I., S. K. Solanki, N. A. Krivova, W. K. Schmutz, W. T. Ball, Reto Knaack, E. V. Rozanov, and Y. C. Unruh. 2014. “The Variability of Sun-like Stars : Reproducing Observed Photometric Trends.” Astronomy & Astrophysics 569 (A38). https://doi.org/10.1051/0004-6361/201323086.
Shapiro, A. I., et al. “The Variability of Sun-like Stars : Reproducing Observed Photometric Trends.” Astronomy & Astrophysics, vol. 569, no. A38, June 2014, https://doi.org/10.1051/0004-6361/201323086.


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