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2001ApJ...560..919B - Astrophys. J., 560, 919-927 (2001/October-3)
Detection of coronal mass ejections in V471 Tauri with the Hubble space telescope.
BOND H.E., MULLAN D.J., O'BRIEN M.S. and SION E.M.
Abstract (from CDS):
We suggest that these transient features arise when coronal mass ejections (CMEs) from the K2 dwarf pass across the line of sight to the WD. Estimates of the velocities, densities, and masses of the events in V471 Tau are generally consistent with the properties of solar CMEs. Given our detection of two events during 6.8 hr of GHRS observing, along with a consideration of the restricted range of latitudes and longitudes on the K star's surface that can give rise to trajectories passing in front of the WD as seen from Earth, we estimate that the active V471 Tau dK star emits some 100-500 CMEs day–1, as compared to ∼1-3 day–1 for the Sun. The K dwarf's mass-loss rate associated with CMEs is at least (5-25)x10–14 M☉ yr–1, but it may well be orders of magnitude higher if most of the silicon is in ionization states other than Si III.
Abstract Copyright: ∼
Journal keyword(s): Stars: Novae, Cataclysmic Variables - Stars: Coronae - Stars: Flare - stars: individual (V471 Tauri) - Stars: Mass Loss
Simbad objects: 2
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