Protostars and Planets VI, Heidelberg, July 15-20, 2013
ANALYSIS OF STAR-DISK INTERACTION IN T TAURI STARS THROUGH MG II LINES IN THE UV
Lopez-Martinez, Fatima (Universidad Complutense de Madrid)
Gomez de Castro, Ana Ines (Universidad Complutense de Madrid)
The Mg II lines are a fundamental tracer of T Tauri stars (TTSs) atmospheres and outflows. This tracer is the strongest feature in the near UV spectrum of
TTSs. 123 observations (from the International Ultraviolet Explorer (IUE) and Hubble Space Telescope (HST) data archives) of Mg II lines in 42 TTSs are analyzed, having a very good sample to study the circumstellar environment of TTSs. The UV luminosities in TTSs exceed by one-two orders of magnitude those observed in Main Sequence stars of the same spectral types. This excess is caused by the presence of a circumstellar disk, remnant of the star formation process, that transports material onto the stellar surface enhancing the flux radiated in the magnetospheric/atmospheric tracers. Analysis of the properties of the outflows, atmospheres and the accretion process based on Mg II tracer are presented in this contribution.
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