Volume 372, Number 1, June II 2001
|Page(s)||119 - 129|
|Section||Interstellar and circumstellar matter|
|Published online||15 June 2001|
Time-series photometric spot modeling
IV. The multi-periodic K5Ve binary V833 Tauri
Konkoly Observatory of the Hungarian Academy of Sciences, 1525 Budapest, Hungary e-mail: email@example.com
2 Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: KStrassmeier@aip.de
3 Institute for Astronomy, University of Vienna, 1180 Vienna, Austria
4 Dept. of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085, USA e-mail: firstname.lastname@example.org
Corresponding author: K. Oláh, email@example.com
Accepted: 7 March 2001
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 K relative to the photosphere is found. This value agrees with previous results from TiO modeling ( 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 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 bands. The flare characteristics are compared to another, 100-times smaller flare observed earlier in 1983.
Key words: stars: activity / stars: atmospheres / stars: late-type / stars: individual: V833 Tau / stars: binaries: close
© ESO, 2001
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