V4046 Sgr: X-rays from accretion shock

C. Argiroffi, A. Maggio, T. Montmerle, D. P. Huenemoerder, E. Alecian, M. Audard, J. Bouvier, F. Damiani, J. -F. Donati, S. Gregory, M. Güdel, G. A. J. Hussain, J. Kastner, G. G. Sacco

Research output: Contribution to journalArticlepeer-review


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....
Original languageEnglish
Pages (from-to)46-47
Number of pages2
JournalProceedings of the International Astronomical Union
Issue numberS302
Publication statusPublished - Aug 2014


  • Accretion, Stars
  • pre-main sequence, X-rays
  • stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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