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V4046 Sgr: X-rays from accretion shock

Published online by Cambridge University Press:  07 August 2014

C. Argiroffi
Dip. di Fisica e Chimica, Università di Palermo, Palermo, Italy, email: INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
A. Maggio
INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
T. Montmerle
Institut d'Astrophysique de Paris, France
D. Huenemoerder
MIT, Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA
E. Alecian
Observatoire de Paris, LESIA, Meudon Principal Cedex, France
M. Audard
ISDC Data Center for Astrophysics, University of Geneva, Switzerland
J. Bouvier
UJF-Grenoble 1/CNRS-INSU, Institut de Planetologie et d'Astrophysique de Grenoble, France
F. Damiani
INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
J.-F. Donati
IRAP-UMR 5277, CNRS & Univ. de Toulouse, France
S. Gregory
School of Physics & Astronomy, University of St Andrews, U.K
M. Güdel
Department of Astronomy, University of Vienna, Austria
G. Hussain
ESO, Garching, Germany
J. Kastner
Center for Imaging Science, Rochester Institute of Technology, NY, USA
G. G. Sacco
INAF Osservatorio Astrofisico di Arcetri, Italy.
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We present results of the X-ray monitoring of V4046 Sgr, a close classical T Tauri star binary, with both components accreting material. The 360 ks long XMM observation allowed us to measure the plasma densities at different temperatures, and to check whether and how the density varies with time. We find that plasma at temperatures of 1–4 MK has high densities, and we observe correlated and simultaneous density variations of plasma, probed by O VII and Ne IX triplets. These results strongly indicate that all the inspected He-like triplets are produced by high-density plasma heated in accretion shocks, and located at the base of accretion flows.

Contributed Papers
Copyright © International Astronomical Union 2014 


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