6533b855fe1ef96bd12b0a42

RESEARCH PRODUCT

X-ray flare modeling in the single giant HR 9024

P. TestaD. Garcia-alvarezFabio RealeD. Huenemoerder

subject

hydrodynamic loop modelsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstrophysics::Solar and Stellar AstrophysicsAstrophysicsAstrophysics::Galaxy Astrophysicshigh resolution X-ray spectroscopy

description

We analyze a Chandra-HETGS observation of the single G-type giant HR 9024. The high flux allows us to examine spectral line and continuum diagnostics at high temporal resolution, to derive plasma parameters (thermal distribution, abundances, temperature, ...). A time-dependent 1D hydrodynamic loop model with semi-length 10$^{12}$cm ($\sim R_{\star}$), and impulsive footpoint heating triggering the flare, satisfactorily reproduces the observed evolution of temperature and emission measure, derived from the analysis of the strong continuum emission. The observed characteristics of the flare appear to be common features in very large flares in active stars (also pre-main sequence stars), possibly indicating some fundamental physics for these very dynamic and extreme phenomena in stellar coronae.

yearjournalcountryeditionlanguage
2005-12-27
http://arxiv.org/abs/astro-ph/0512624