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

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

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...462l..41s&link_type=abstract

Astronomy and Astrophysics, Volume 462, Issue 3, February II 2007, pp.L41-L44

Astronomy and Astrophysics

Astrophysics

5

X-Rays: Stars, Stars: Pre-Main Sequence, Stars: Coronae, Stars: Activity

Scientific paper

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 ˜ 8.5 days. Clear, but uncorrelated variability is found at both wavebands. The variability observed at ~2100 Å 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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