X-ray flare modeling in the single giant HR 9024

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dc.creatorTesta, Paola
dc.creatorGarcia-Alvarez, David
dc.creatorReale, Fabio
dc.creatorHuenemoerder, David
dc.date2005-12-28
dc.date.accessioned2026-07-07T06:49:14Z
dc.date.available2026-07-07T06:49:14Z
dc.descriptionWe 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.
dc.description2 pages, 4 figures. To be included in the proceedings of the 'X-ray universe 2005 meeting' held in San Lorenzo de El Escorial (Spain), 26-30 Sep 2005
dc.identifierhttps://arxiv.org/abs/astro-ph/0512624
dc.identifierhttp://arxiv.org/abs/astro-ph/0512624
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104265
dc.subjectAstrophysics
dc.titleX-ray flare modeling in the single giant HR 9024
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