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| - IV. The multi-periodic K5Ve binary V833 Tauri
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| - Time-series photometric spot modeling
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| - We analysed all the existing photometric observations of V833 Tau and found long-term variability on time scales of ≈70 years, 6.5 years and 2.4 years. Using V and IC-band data from 1990-2000, we obtained starspot surface distributions from 20 suitable light curves. We found that the spot-area changes generally follow the long-term light variations. Spot temperatures are determined for each of the datasets and an average value of $1230 {\rm K}\pm270$ K relative to the photosphere is found. This value agrees with previous results from TiO modeling ( $1330 {\rm K}\pm110$ K). Small scale spot temperature and area changes are recovered during 1997-1999, that we explain with a variable spot/faculae ratio. A powerful flare in $UBV(RI)_{\rm C}$ was observed in 1993 November. A 10 000 K fit yielded a total emitted flare energy of more than 10 34 ergs from an area of about 1.3% of the stellar surface, 60% of it in the $V(RI)_{\rm C}$ bands. The flare characteristics are compared to another, 100-times smaller flare observed earlier in 1983.
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