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XMM-Newton spectroscopy of the metal depleted T Tauri star TWA 5 | | C. Argiroffi
; A. Maggio
; G. Peres
; B. Stelzer R. Neuhäuser
; | | Date: |
4 May 2005 | | Subject: | astro-ph | | Affiliation: | 1 and 2) R. Neuhäuser ( Dip. di Scienze Fisiche ed Astronomiche, Università di Palermo, Italy INAF - Osservatorio Astronomico di Palermo, Italy Astrophysikalisches Institut und Universitäts-Sternwarte, Jena, Germany | | Abstract: | We present results of X-ray spectroscopy for TWA 5, a member of the young TW Hydrae association, observed with XMM-Newton. TWA~5 is a multiple system which shows Halpha emission, a signature typical of classical T Tauri stars, but no infrared excess. From the analysis of the RGS and EPIC spectra, we have derived the emission measure distribution vs. temperature of the X-ray emitting plasma, its abundances, and the electron density. The characteristic temperature and density of the plasma suggest a corona similar to that of weak-line T Tauri stars and active late-type main sequence stars. TWA 5 also shows a low iron abundance (~0.1 times the solar photospheric one) and a pattern of increasing abundances for elements with increasing first ionization potential reminiscent of the inverse FIP effect observed in highly active stars. The especially high ratio Ne/Fe~10 is similar to that of the classical T Tauri star TW Hya, where the accreting material has been held responsible for the X-ray emission. We discuss the possible role of an accretion process in this scenario. Since all T Tauri stars in the TW Hydrae association studied so far have very high Ne/Fe ratios, we also propose that environmental conditions may cause this effect. | | Source: | arXiv, astro-ph/0505075 | | Services: | Forum | Review | PDF | Favorites | |
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