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: firstname.lastname@example.org
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: email@example.com
Corresponding author: K. Oláh, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.