Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...679.1509g&link_type=abstract
The Astrophysical Journal, Volume 679, Issue 2, pp. 1509-1521.
Astronomy and Astrophysics
Astronomy
10
Stars: Abundances, Stars: Activity, Stars: Coronae, Sun: Corona, X-Rays: Stars
Scientific paper
AB Dor, Speedy Mic, and Rst 137B are in their early post-T Tauri evolutionary phase (<100 Myr), at the age of fastest rotation in the life of late-type stars. They straddle the coronal saturation-supersaturation boundary first defined by young stars in open clusters. High-resolution Chandra X-ray spectra have been analyzed to study their coronal properties as a function of coronal activity parameters Rossby number, LX/Lbol, and a coronal temperature index. Differences between stars suggest that as supersaturation is reached the DEM slope below the temperature of peak DEM becomes shallower, while the DEM drop-off above this temperature becomes more pronounced. A larger sample comprising our three targets and 22 active stars studied in the recent literature reveals a general increase of plasma at T>~107 K toward the saturated-supersaturated boundary but a decline beyond this among supersaturated stars. The coronal Fe abundances of the stellar sample are inversely correlated with LX/Lbol, declining slowly with rising LX/Lbol, but with a much more sharp decline at LX/Lbol>~3×10-4. For dwarfs the Fe abundance is also well correlated with Rossby number. The coronal O/Fe ratios for dwarfs show a clear increase with decreasing Rossby number, apparently reaching saturation at [O/Fe]=0.5 at the coronal supersaturation boundary.
Ball Brian
Drake Jeremy J.
Garcia-Alvarez David
Kashyap Vinay L.
Lin Lin
No associations
LandOfFree
Coronae of Young Fast Rotators does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coronae of Young Fast Rotators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronae of Young Fast Rotators will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1428063