Complex overlapping X-ray flares on AB Dor show phase-locked NH enhancements interpreted as transient cool absorbing plasma from eruptive coronal restructuring, while classical flares do not.
Six Large Coronal X-ray Flares Observed With Chandra
1 Pith paper cite this work, alongside 31 external citations. Polarity classification is still indexing.
1
Pith paper citing it
31
external citations · Pith
abstract
A study of the six largest coronal X-ray flares in the Chandra archive is presented. The flares were observed on II Peg, OU And, Algol, HR 1099, TZ CrB and CC Eri, all with the High Energy Transmission Grating spectrometer (HETG) and the ACIS detectors. We reconstruct an Emission Measure Distribution EMD(T), using a spectral line analysis method, for flare and quiescence states separately and compare the two. Subsequently, elemental abundaces are obtained from the EMD. We find similar behaviour of the EMD in all flares, namely a large high-T component appears while the low-T (kT < 2 keV) plasma is mostly unaffected, except for a small rise in the low-T Emission Measure. In five of the six flares we detect a First Ionization Potential (FIP) effect in the flare abundances relative to quiescence. This may contradict previous suggestions that flares are the cause of an inverse FIP effect in highly active coronae.
fields
astro-ph.SR 1years
2026 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
-
Probing Flare-Associated Eruptions on AB Doradus via X-ray Absorption Variations
Complex overlapping X-ray flares on AB Dor show phase-locked NH enhancements interpreted as transient cool absorbing plasma from eruptive coronal restructuring, while classical flares do not.