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Modeling Stellar Micro ares
Vinay Kashyap, Jeremy Drake, 1 Manuel
Gudel, and Marc Audard 2
1 Overview
An open question in the eld of Solar and stellar astrophysics is the source
of heating that causes stellar coronae to reach temperatures of millions of
degrees. One possibility is that the coronae are heated by a large number
of small ares (see Audard et al. (2000), Drake et al. (2000)). On the
Sun, micro ares are distributed with energy as a power-law of the form
dE = k  E , with = 1:8, and appears to increase to values 2.2-2.9 for
ares of lower energy (cf. Aschwanden et al. (2000)). If the slope exceeds
the critical value of 2, then in principle the entire coronal energy input
may be ascribed to ares that are increasingly less energetic, but are more
numerous. We have developed a new method to model these weak ares in
photon arrival-time data.
2 Method
Model: Because are onset is stochastic in nature, the light curves can-


Source: Audard, Marc - INTEGRAL Science Data Centre & Observatory of Geneva, Université de Genève
Guedel, Manuel - Institut für Astronomie, Universität Wien


Collections: Physics