Time-series photometric spot modeling. IV. The multi-periodic K5Ve binary V833 Tauri

Details Time-series photometric spot modeling. IV. The multi-periodic K5Ve binary V833 Tauri Time-series photometric spot modeling. IV. The multi-periodic K5Ve binary V833 Tauri

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...372..119o&link_type=abstract

Astronomy and Astrophysics, v.372, p.119-129 (2001)

Astronomy and Astrophysics

Astrophysics

10

Stars: Activity, Stars: Atmospheres, Stars: Late-Type, Stars: Individual: V833 Tau, Stars: Binaries: Close

Scientific paper

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 K+/-270 K relative to the photosphere is found. This value agrees with previous results from TiO modeling (1330 K+/-110 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)C was observed in 1993 November. A 10 000 K fit yielded a total emitted flare energy of more than 1034 ergs from an area of about 1.3% of the stellar surface, 60% of it in the V(RI)C bands. The flare characteristics are compared to another, 100-times smaller flare observed earlier in 1983.

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