SIMBAD references

2007A&A...462L..41S - Astronomy and Astrophysics, volume 462, L41-44 (2007/2-2)

Discovery of variable X-ray absorption in the cTTS AA Tauri.


Abstract (from CDS):

We present XMM-Newton X-ray and UV observations of the classical T Tauri star AA Tau covering almost two rotational periods where Prot∼8.5days. Clear, but uncorrelated variability is found at both wavebands. The variability observed at ∼2100Å 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.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: pre-main sequence - stars: coronae - stars: activity

Simbad objects: 10

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