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Issue A&A
Volume 432, Number 2, March III 2005
Page(s) L35 - L38
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500014



A&A 432, L35-L38 (2005)
DOI: 10.1051/0004-6361:200500014

Letter

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

J. H. M. M. Schmitt1, J. Robrade1, J.-U. Ness2, F. Favata3 and B. Stelzer4

1  Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
    e-mail: jschmitt@hs.uni-hamburg.de
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

(Received 10 November 2004 / Accepted 26 January 2005 )

Abstract
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

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© ESO 2005


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