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X-rays from accretion shocks in T Tauri stars: The case of BP Tau

2005; EDP Sciences; Volume: 432; Issue: 2 Linguagem: Inglês

10.1051/0004-6361

1432-0746

J. H. M. M. Schmitt, J. Robrade, J. U. Ness, F. Favata, B. Stelzer,

Stellar, planetary, and galactic studies

We present an XMM-Newton observation of the classical T Tauri star BP Tau. In the XMM-Newton RGS spectrum the O vii triplet is clearly detected with a very weak forbidden line indicating high plasma densities and/or a high UV flux environment. At the same time concurrent UV data point to a small hot spot filling factor suggesting an accretion funnel shock as the site of the X-ray and UV emission. Together with the X-ray data on TW Hya these new observations suggest such funnels to be a general feature in classical T Tauri stars.