Volume 432, Number 2, March III 2005
|Page(s)||L35 - L38|
|Published online||02 March 2005|
Letter to the Editor
X-rays from accretion shocks in T Tauri stars: The case of BP Tau
Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany e-mail: email@example.com
2 University of Oxford, Department of Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, UK
3 Astrophysics Division, ESA/ESTEC, PO Box 299, 2200 AG, Noordwijk, The Netherlands
4 Dipartimento di Scienze Fisiche e Astronomiche, Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
Accepted: 26 January 2005
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.
Key words: X-rays: stars / stars: individual: BP Tau / stars: pre-main sequence, coronae, activity / accretion
© ESO, 2005
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