Flare Activity of V833 Tau from TESS Observations

We present a flare analysis of the active late-type star V833 Tau using multi-sector TESS observations. Flare events were identified through a semi-automated approach combining sigma-based detection and manual inspection, allowing reliable characterization of both simple and complex flare morphologies.

Flare energies were derived from equivalent duration measurements using an SED-based estimate of the stellar luminosity in the TESS band-pass. The cumulative flare frequency distribution (FFD) follows a power law with slope a ≈ −0.77, indicating a relatively strong contribution from high-energy events. Sector-by-sector analysis shows no statistically significant variation in FFD slopes, suggesting that the flare generation process remained broadly stable over the observed time baseline. No statistically significant clus tering of flare occurrence with rotational phase is detected, even for the most energetic events. The absence of a clear phase dependence indicates that flares are not concentrated at a small number of persistent active longitudes. However, this does not uniquely determine the spatial relationship between chromospheric flares and photospheric starspots. The observed behaviour may also be explained by geometric effects, such as high-latitude or polar active regions, or by a distributed spot configuration in which active regions remain visible over a wide range of rotational phases. These results highlight the need for complementary surface mapping and chromospheric diagnostics to clarify the connection between photospheric and chromospheric activity.