Characteristics of Long-Term Spot Activity on Several Late-Spectral-Type Stars
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
Characteristics of Long-Term Spot Activity on Several Late-Spectral-Type Stars
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| Автор |
Kozhevnikova, A. V.
Alekseev, I. Y. Kozhevnikov, V. P. |
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| Тематика |
STAR SPOTS
STELLAR ACTIVITY VARIABLE STARS |
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| Описание |
Abstract: We present our analysis of many-year photometry for several dozens of chromospherically active stars that exhibit solar-type activity (from our own observations as well as from data in the literature). Modeling of the distribution of cool photospheric spots, based on the zonal model, was performed, with several hundred models constructed. We find that, for most stars, their spots are located at intermediate and moderate latitudes and that the largest spotted areas can cover from 7 to 58% of the star’s surface. We demonstrate that a latitude drift of spots can be suspected for a number of stars, towards the equator as well as towards the pole; however, the rate of this drift is several times lower than for solar spots. For 15 stars, we detected the presence of activity cycles from 3 to 28 years long that reveal themselves in variations of the system’s brightness as well as in variations of the total spot coverage of the star. This paper is based on a talk presented at the memorial astrophysical workshop “Novelties in Understanding the Evolution of Binary Stars” dedicated to the 90th birthday of Prof. M.A. Svechnikov. © 2023, The Author(s).
Ministry of Education and Science of the Russian Federation, Minobrnauka: FEUZ-2023-0019 Thus study was financially supported by the Ministry of Science and Higher Education of Russian Federation, theme FEUZ-2023-0019. |
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| Дата |
2024-04-05T16:37:29Z
2024-04-05T16:37:29Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Kozhevnikova, A, Alekseev, I & Kozhevnikov, V 2023, 'Characteristics of Long-Term Spot Activity on Several Late-Spectral-Type Stars', Astronomy Reports, Том. 67, № 9, стр. 929-937. https://doi.org/10.1134/S1063772923090081
Kozhevnikova, A., Alekseev, I., & Kozhevnikov, V. (2023). Characteristics of Long-Term Spot Activity on Several Late-Spectral-Type Stars. Astronomy Reports, 67(9), 929-937. https://doi.org/10.1134/S1063772923090081 1063-7729 Final All Open Access, Hybrid Gold https://www.scopus.com/inward/record.uri?eid=2-s2.0-85179351529&doi=10.1134%2fS1063772923090081&partnerID=40&md5=140291b91537e961ab17d8fb106434e1 https://link.springer.com/content/pdf/10.1134/S1063772923090081.pdf http://elar.urfu.ru/handle/10995/131041 10.1134/S1063772923090081 85179351529 001122207000002 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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| Издатель |
Pleiades Publishing
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| Источник |
Astronomy Reports
Astronomy Reports |
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