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We present analysis of the starspot properties and chromospheric activity onHD 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 years1995-2013. We applied a two-spot model with GLS determined period$P=4.436391\pm0.00137$ day to model chunks sliding over TESS light curve, andmeasured relative equivalent widths of Ca II H and K, H$\beta$ and H$\alpha$emissions by subtracting overall spectrum from individual spectrum. It wasfound that a two-spot configuration, i.e. a primary, slowly evolving andlong-lasting spot (P) plus a secondary and rapidly evolving spot (S), wascapable of explaining the data, although the actual starspot distribution isunable to derived from collected data. Despite the spot radius-latitudedegeneracy revealed in the best-fit solutions, a sudden alternation between Pand S radii followed by gradual decrease of S in T1 and the decrease of both Pand S from T1 to T2 were significant, corresponding to the evolution ofmagnetic activity. Besides, S revealed rotation and oscillatory longitudemigration 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 eachother and revealed rotational modulation as well as a long-term decrease ofemissions, implying the existence and evolution of magnetic acitivity on HD134319.

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