Publications of the MPIfR Optical & Infrared
Interferometry Group
T. Preibisch
X-ray Activity and Accretion in Young Stellar Objects (invited
review talk)
Astrophysics and Space Science, v.292, Issue 1,
p. 631-641 (2004)
Abstract
I discuss recent observational results on the X-ray properties of young
stellar objects, based mostly on Chandra and XMM-Newton observations.
The sensitive X-ray data on large, well characterized samples of T
Tauri
stars (and a number of protostars) allow to study in detail the
dependence of magnetic activity on the bulk properties of the young
objects and to draw important clues towards the origin of the X-ray
emission. The absence of a relation between X-ray activity and rotation
for T Tauri stars clearly suggests that their magnetic activity cannot
be simply explained by the action of a scaled-up solar-like dynamo. I
discuss alternative models for the generation of magnetic fields and
also consider the long standing question whether the X-ray properties
of
the T Tauri stars are related to the presence/absence of circumstellar
disks or active accretion.
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