SIMBAD references

2005A&A...439.1149A - Astronomy and Astrophysics, volume 439, 1149-1158 (2005/9-1)

XMM-Newton spectroscopy of the metal depleted T Tauri star TWA 5.


Abstract (from CDS):

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 Hα emission, a signature typical of classical T Tauri stars, but no infrared excess. From this 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 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.

Abstract Copyright:

Journal keyword(s): X-rays: stars - techniques: spectroscopic - stars: activity - stars: abundances - stars: pre-main sequence - stars: individual: TWA 5

VizieR on-line data: <Available at CDS (J/A+A/439/1149): tablea1.dat>

Simbad objects: 13

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