HD 4915 at the beginning of Maunder minimum of activity

0574644 - FZÚ 2024 RIV RU eng J - Journal Article
Savanov, I.S. - Dmitrienko, E.S. - Karpov, Sergey - Lyapsina, N.V. - Beskin, G.M. - Biryukov, A.V. - Gutaev, A.G. - Ivanov, E.A. - Perkov, A.V. - Sasyuk, V.V.
HD 4915 at the beginning of Maunder minimum of activity.
Astrophysical Bulletin. Roč. 78, č. 2 (2023), s. 194-199. ISSN 1990-3413. E-ISSN 1990-3421
Institutional support: RVO:68378271
Keywords : stars:activity * HD 4915
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 1.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1134/S1990341323020074

Based on the available photometric data spanning almost 8000 days (21.9 years) of observations of a bright G5 V dwarf, solar-type star HD 4915, we carried out a study of the manifestations of its activity, probably transitioning to a state similar to the Maunder Minimum. To estimate the duration of the possible activity cycles of the star, we used three independent data sets. We obtained evidence of HD 4915 light variations, including the interval of time corresponding to a decrease in its chromospheric activity variations. Based on the constructed power spectrum, we can suggest the existence of possible cycles of the order of 1640 and 630 days (4.5 and 1.7 years) for the object’s brightness, which are comparable with the chromospheric activity cycle estimate of 4–4.2 years, significantly shorter than the duration of the magnetic activity cycle of the Sun, which is a distinguishing feature of HD 4915.
Permanent Link: https://hdl.handle.net/11104/0350383