Spectral Indications of Density Variability in the Corona of AD Leonis
arXiv:astro-ph/0502379 · doi:10.1086/429487
Abstract
Direct comparison of high-resolution X-ray spectra of the active dMe star AD Leo, observed three times with Chandra, shows variability of key density-sensitive lines, possibly due to flaring activity. In particular, a significant long-duration enhancement of the coronal density is indicated by the Ne IX and Si XIII He-like triplets, and possibly also by density-sensitive Fe XXI line ratios.
arXiv commentTo be published in ApJ Letters
References in corpus (12)
- Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
- An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
- X-ray astronomy of stellar coronae (Review)
- EUV Flare Activity in Late-Type Stars
- On the sizes of stellar X-ray coronae
- The Density of Coronal Plasma in Active Stellar Coronae
- X-Ray Evidence for Flare Density Variations and Continual Chromospheric Evaporation in Proxima Centauri
- Coronal density diagnostics with Helium-like triplets: CHANDRA--LETGS observations of Algol, Capella, Procyon, Eps Eri, Alpha Cen A&B, UX Ari, AD Leo, YY Gem, and HR1099
- Modeling the NeIX Triplet Spectral Region of Capella with the Chandra and XMM-Newton Gratings
- AD Leonis: Flares observed by XMM-Newton and Chandra
- The EUVE point of view of AD Leo
- X-ray spectroscopy of the unsteady quiescent corona of AD Leo with Chandra