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An investigation of the magnetic activity of HD 134319 based on TESS photometry and ground-based spectroscopy

We present analysis of the starspot properties and chromospheric activity on HD 134319 using high precision photometry by TESS in sectors 14–16 (T1), 21–23 (T2) and high-resolution spectroscopy by OHP/ELODIE and Keck/HIRES during years 1995–2013. We applied a two-spot model with GLS determined period P = 4.436391 ± 0.00137 day to model chunks sliding over TESS light curve, and measured relative equivalent widths of Ca II H and K, Hβ and Hα emissions by subtracting overall spectrum from individual spectrum. It was found that a two-spot configuration, i.e. a primary, slowly evolving and long-lasting spot (P) plus a secondary and rapidly evolving spot S, was capable of explaining the data, although the actual starspot distribution is unable to derived from collected data. Despite the spot radius-latitude degeneracy revealed in the best-fit solutions, a sudden alternation between P and S radii followed by gradual decrease of S in T1 and the decrease of both P and S from T1 to T2 were significant, corresponding to the evolution of magnetic activity. Besides, S revealed rotation and oscillatory longitude migration synchronized to P in T1, but held much larger migration than P in T2. This might indicate the evolution of internal magnetic configuration. Chromospheric activity indicators were found to tightly correlated with each other and revealed rotational modulation as well as a long-term decrease of emissions, implying the existence and evolution of magnetic acitivity on HD 134319.