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  Signatures of Magnetic Activity: On the Relation between Stellar Properties and p-mode Frequency Variations

Santos, A. R. G., Campante, T. L., Chaplin, W. J., Cunha, M. S., van Saders, J. L., Karoff, C., et al. (2019). Signatures of Magnetic Activity: On the Relation between Stellar Properties and p-mode Frequency Variations. The Astrophysical Journal, 883(1): 65. doi:10.3847/1538-4357/ab397a.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0006-68CE-E Versions-Permalink: https://hdl.handle.net/21.11116/0000-0006-71F7-4
Genre: Zeitschriftenartikel

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 Urheber:
Santos, A. R. G., Autor
Campante, T. L., Autor
Chaplin, W. J., Autor
Cunha, M. S., Autor
van Saders, J. L., Autor
Karoff, C., Autor
Metcalfe, T. S.1, Autor
Mathur, S., Autor
García, R. A., Autor
Lund, M. N., Autor
Kiefer, R., Autor
Aguirre, V. Silva, Autor
Davies, G. R., Autor
Howe, R., Autor
Elsworth, Y., Autor
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1832287              

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Schlagwörter: -
 Zusammenfassung: In the Sun, the properties of acoustic modes are sensitive to changes in the magnetic activity. In particular, mode frequencies are observed to increase with increasing activity level. Thanks to CoRoT and Kepler, such variations have been found in other solar-type stars and encode information on the activity-related changes in their interiors. Thus, the unprecedented long-term Kepler photometric observations provide a unique opportunity to study stellar activity through asteroseismology. The goal of this work is to investigate the dependencies of the observed mode frequency variations on the stellar parameters and whether those are consistent with an activity-related origin. We select the solar-type oscillators with highest signal-to-noise ratio, in total, 75 targets. Using the temporal frequency variations determined in Santos et al., we study the relation between those variations and the fundamental stellar properties. We also compare the observed frequency shifts with chromospheric and photometric activity indexes, which are only available for a subset of the sample. We find that frequency shifts increase with increasing chromospheric activity, which is consistent with an activity-related origin of the observed frequency shifts. Frequency shifts are also found to increase with effective temperature, which is in agreement with the theoretical predictions for the activity-related frequency shifts by Metcalfe et al. Frequency shifts are largest for fast rotating and young stars, which is consistent with those being more active than slower rotators and older stars. Finally, we find evidence for frequency shifts increasing with stellar metallicity.

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Sprache(n): eng - English
 Datum: 2019
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.3847/1538-4357/ab397a
 Art des Abschluß: -

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Titel: The Astrophysical Journal
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Bristol; Vienna : IOP Publishing; IAEA
Seiten: - Band / Heft: 883 (1) Artikelnummer: 65 Start- / Endseite: - Identifikator: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3