A Far-Ultraviolet Flare on a Pleiades G Dwarf
Linsky, J. L.; Basri, G. S.; Antiochos, S. K.; Simon, Theodore; Doschek, G. A.; Walter, F. M.; Stern, R. A.; Brown, A.; Stauffer, J. R.; Ayres, T. R.; Bookbinder, J. A.; Ramsey, L. W.
United States
Abstract
The Hubble Space Telescope/Faint Object Spectrograph (HST/FOS) recorded a remarkable transient brightening in the C IV lambda lambda 1548,50 emissions of the rapidly rotating Pleiades G dwarf H II 314. On the one hand the 'flare' might be a rare event luckily observed; on the other hand it might be a bellwether of the coronal heating in very young solar-mass stars. If the latter, flaring provides a natural spin-down mechanism through associated sporadic magnetospheric mass loss.