Evolution of brightness and magnetic features of young solar-type stars - II. The young F8 star HIP 71933
Article
Hughes, J E, Marsden, S C, Carter, B, Waite, I A, Burton, D M, Perugini, G M and Hebrard, E M. 2023. "Evolution of brightness and magnetic features of young solar-type stars - II. The young F8 star HIP 71933." Monthly Notices of the Royal Astronomical Society. 524 (2), pp. 1757-1774. https://doi.org/10.1093/mnras/stad748
Article Title | Evolution of brightness and magnetic features of young solar-type stars - II. The young F8 star HIP 71933 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Hughes, J E, Marsden, S C, Carter, B, Waite, I A, Burton, D M, Perugini, G M and Hebrard, E M |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 524 (2), pp. 1757-1774 |
Number of Pages | 18 |
Year | 2023 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stad748 |
Web Address (URL) | https://academic.oup.com/mnras/article/524/2/1757/7076881 |
Abstract | The early, active history of our Sun is still not fully understood. Observations of the magnetic fields on active young solar-type stars allow us an insight into the early evolution of our Sun. Here we present Doppler and Zeeman–Doppler images of the young late-F star HIP 71933 (HD 129181) at multiple epochs to add to the growing data about the evolution of magnetic cycles in solar-type stars. Spectroscopic data were obtained over seven epochs spanning 10 yr of observations, with two epochs including spectropolarimetric data. The brightness maps at all epochs show a consistent spot activity in a non-uniform ring at a latitude of approximately +60° with no polar spot present in any epoch. The two magnetic field maps taken ∼2 yr apart show a strong poloidal field configuration with most of the poloidal field energy in the dipolar configuration. The magnetic maps show no evidence of a polarity reversal. We were able to measure the differential rotation from one of the seven epochs using the brightness data finding a dΩ of 0.325 ± 0.01 rad d−1. The values for the rotational period and differential rotation found for HIP 71933 are consistent with values found for other late-F or early-G stars. The dominant poloidal features and the limited spots at the pole are unusual for a rapidly rotating star but not unique. |
Keywords | line: profiles; stars: individuall: HIP 71933; stars: magnetic fields ; stars: solar-type; starspots |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Centre for Astrophysics |
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https://research.usq.edu.au/item/z25z9/evolution-of-brightness-and-magnetic-features-of-young-solar-type-stars-ii-the-young-f8-star-hip-71933
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