{"title":"Activity Cycles of dM4e Dwarf GJ 1243","authors":"E. S. Dmitrienko, I. S. Savanov","doi":"10.1007/s10511-025-09844-7","DOIUrl":null,"url":null,"abstract":"<p>The dM4e dwarf GJ 1243 (KIC 9726699) has been a subject of extensive research due to its unique flare activity and the evolution of spots on its surface. This paper presents the results of a study into the long-term activity cycles of this star, derived from archival photometric time series. Observations from three independent surveys in different photometric filters indicate long-timescale variability in the luminosity of GJ 1243, with four characteristic cycle durations (we will number them from 1 to 4), clustered around the following <i>P</i><sub><i>cycl</i></sub> values (1 to 3): 1.5 years, 2.6 years, and 6.3 years, respectively, and near <i>P</i><sub><i>cycl</i></sub> (4) of the order of 12.3–12.6 years. A detailed analysis of the GJ 1243 data on the logarithmic <i>P</i><sub><i>cycl</i></sub>/<i>P</i><sub><i>rot</i></sub> versus 1/<i>P</i><sub><i>rot</i></sub> diagram and comparisons with other M dwarfs reveal a unified relationship for short cycles across the studied stars.</p>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"67 4","pages":"454 - 462"},"PeriodicalIF":0.6000,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10511-025-09844-7","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
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Abstract
The dM4e dwarf GJ 1243 (KIC 9726699) has been a subject of extensive research due to its unique flare activity and the evolution of spots on its surface. This paper presents the results of a study into the long-term activity cycles of this star, derived from archival photometric time series. Observations from three independent surveys in different photometric filters indicate long-timescale variability in the luminosity of GJ 1243, with four characteristic cycle durations (we will number them from 1 to 4), clustered around the following Pcycl values (1 to 3): 1.5 years, 2.6 years, and 6.3 years, respectively, and near Pcycl (4) of the order of 12.3–12.6 years. A detailed analysis of the GJ 1243 data on the logarithmic Pcycl/Prot versus 1/Prot diagram and comparisons with other M dwarfs reveal a unified relationship for short cycles across the studied stars.
期刊介绍：
Astrophysics (Ap) is a peer-reviewed scientific journal which publishes research in theoretical and observational astrophysics. Founded by V.A.Ambartsumian in 1965 Astrophysics is one of the international astronomy journals. The journal covers space astrophysics, stellar and galactic evolution, solar physics, stellar and planetary atmospheres, interstellar matter. Additional subjects include chemical composition and internal structure of stars, quasars and pulsars, developments in modern cosmology and radiative transfer.
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