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1998AJ....115.1610V - Astron. J., 115, 1610-1616 (1998/April-0)
Ultraviolet spectroscopy of AB Doradus with the Hubble space telescope: impulsive flares and bimodal profiles of C IV lambda1549 in a young star.
VILHU O., MUHLI P., HUOVELIN J., HAKALA P., RUCINSKI S.M. and COLLIER CAMERON A.
Abstract (from CDS):
The transition region was observed to flare frequently with different timescales and magnitudes. The largest impulsive flare seen in the C IV λ1549 emission, at day 14.22, reached in less than 1 minute a peak differential emission measure N2e V (104.85-105.15 K) = 1051.2 cm–3 and returned exponentially in 5 minutes to the 7 times lower quiescent level. The 3 minute average line profile of the flare was blueshifted (-190 km.s–1) and broadened (FWHM = 800 km.s–1). This impulsive flare could have been due to a chromospheric heating and subsequent evaporation by an electron beam, accelerated (by reconnection) at the apex of a coronal loop.
Abstract Copyright: ∼
Journal keyword(s): Stars: Chromospheres - Stars: Flare - Stars: Pre-Main-Sequence - Ultraviolet Emission
Simbad objects: 3
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