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Article: Stellar activity cycles as revealed by long-term beat-like patterns from light curves of Kepler

TitleStellar activity cycles as revealed by long-term beat-like patterns from light curves of Kepler
Authors
Keywordsstars: activity
stars: rotation
starspots
Issue Date2021
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/1674-4527/
Citation
Research in Astronomy and Astrophysics, 2021, v. 21 n. 6, p. article no. 142 How to Cite?
AbstractStellar activity cycles have been found on many stars through different methods. Although in debate, an empirical relation has been found where a period of stellar activity cycle Pcyc is positively correlated with rotation period Prot along some segregated branches. In this work, we built a systematic process to search for the Kepler objects that are analogous to the long-term solar brightness variations and investigate their possible origins. After a rigorous selection, we obtained 43 objects that all exhibit clear long-term beat-like patterns and their variability (amplitude of rotational modulation) periods and rotation periods were derived. Due to the 4-year duration of the Kepler mission, our targets are located in the region where the cycle periods are longer than ∼1 yr and shorter than ∼2.5 yr. However, all of our targets exhibit clear and notable quasi-periodic variations in variability, yet we cannot confirm any linear trends that were predicted by previous research independently. This may suggest that in the Kepler realm of the Pcyc–Prot diagram, these relations would mix with each other or the beat-like patterns may not be related to the stellar cycle unless other evidence is provided.
Persistent Identifierhttp://hdl.handle.net/10722/302469
ISSN
2023 Impact Factor: 1.8
2023 SCImago Journal Rankings: 0.641
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHan, HG-
dc.contributor.authorCui, KM-
dc.contributor.authorLiu, JF-
dc.contributor.authorYang, HQ-
dc.contributor.authorFang, X-
dc.contributor.authorZhao, RN-
dc.date.accessioned2021-09-06T03:32:44Z-
dc.date.available2021-09-06T03:32:44Z-
dc.date.issued2021-
dc.identifier.citationResearch in Astronomy and Astrophysics, 2021, v. 21 n. 6, p. article no. 142-
dc.identifier.issn1674-4527-
dc.identifier.urihttp://hdl.handle.net/10722/302469-
dc.description.abstractStellar activity cycles have been found on many stars through different methods. Although in debate, an empirical relation has been found where a period of stellar activity cycle Pcyc is positively correlated with rotation period Prot along some segregated branches. In this work, we built a systematic process to search for the Kepler objects that are analogous to the long-term solar brightness variations and investigate their possible origins. After a rigorous selection, we obtained 43 objects that all exhibit clear long-term beat-like patterns and their variability (amplitude of rotational modulation) periods and rotation periods were derived. Due to the 4-year duration of the Kepler mission, our targets are located in the region where the cycle periods are longer than ∼1 yr and shorter than ∼2.5 yr. However, all of our targets exhibit clear and notable quasi-periodic variations in variability, yet we cannot confirm any linear trends that were predicted by previous research independently. This may suggest that in the Kepler realm of the Pcyc–Prot diagram, these relations would mix with each other or the beat-like patterns may not be related to the stellar cycle unless other evidence is provided.-
dc.languageeng-
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/1674-4527/-
dc.relation.ispartofResearch in Astronomy and Astrophysics-
dc.rightsResearch in Astronomy and Astrophysics. Copyright © Institute of Physics Publishing Ltd.-
dc.rightsThis is an author-created, un-copyedited version of an article published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/[insert DOI].-
dc.subjectstars: activity-
dc.subjectstars: rotation-
dc.subjectstarspots-
dc.titleStellar activity cycles as revealed by long-term beat-like patterns from light curves of Kepler-
dc.typeArticle-
dc.identifier.emailFang, X: fangx@hku.hk-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/1674-4527/21/6/142-
dc.identifier.scopuseid_2-s2.0-85112385628-
dc.identifier.hkuros324657-
dc.identifier.volume21-
dc.identifier.issue6-
dc.identifier.spagearticle no. 142-
dc.identifier.epagearticle no. 142-
dc.identifier.isiWOS:000684227700001-
dc.publisher.placeUnited Kingdom-

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