Journal
ASTRONOMY & ASTROPHYSICS
Volume 462, Issue 3, Pages L41-L44Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20066693
Keywords
X-rays : stars; stars : pre-main sequence; stars : coronae; stars : activity
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We present XMM-Newton X-ray and UV observations of the classical T Tauri star AA Tau covering almost two rotational periods where P-rot similar to 8.5 days. Clear, but uncorrelated variability is found at both wavebands. The variability observed at similar to 2100 <-angstrom follows the previously known optical period. Spectral analysis of the X-ray data results in significant variability in the X-ray absorption such that the times of maximal X-ray absorption and UV extinction coincide. Placing the coronal emission in regions at low up to moderate magnetic latitudes and attribution of the variable X-ray absorption to accretion curtains and/or the disk warp provides a consistent physical picture. However, the derived X-ray absorption and optical extinction at times of maximal optical/UV brightness, i.e. outside occultation, are difficult to reconcile, requiring additional absorption in a disk wind or a peculiar dust grain distribution.
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