Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-01-22
Astronomy and Astrophysics
Astrophysics
9 pages, 7 figures, accepted for publication in Astronomy & Astrophysics
Scientific paper
We present evidence for rotational modulation of X-ray flares by an analysis of four outbursts on late-type stars. Three of these flares have been observed on T Tauri Stars and one on Algol. The structure of the X-ray lightcurves observed in this selection of flare events is untypical in that the maximum emission extends over several hours producing a round hump in the lightcurve instead of a sharp peak. We explain this deviation from the standard shape of a flare lightcurve as the result of a flare erupting on the back side of the star and gradually moving into the line of sight due to the star's rotation. An estimate for the decay timescale and the size of the X-ray emitting volume is derived. Spectral information supports our proposition that changes of the visible volume are responsible for the observed time development of these flares.
Casanova Sabrina
Montmerle Th.
Neuhaeuser Ralph
Stelzer Beate
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