Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..538l&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Mg II resonance doublet is produced in the cromosphere of T-Tauri stars (TTSs) at 2795-2802 A. The Mg II feature is the strongest one in the near-ultraviolet spectra of TTSs. These profiles display a broad emission with a central narrow absorption. In some profiles blueshifted absorption is observed overimposed to the broad emission indicating the presence of a wind. The narrow central absorption is produced in the interstella/circumstellar medium. Henceforth, the Mg II is a fundamental tracer of the TTSs atmospheres and circumstellar environments. There are 73 observations of the Mg II lines in TTSs in the International Ultraviolet Explorer (IUE) and Hubble Space Telescope (HST) data archives. This provides an excellent sample to study the environment of TTSs. The profiles of 19 TTSs have been studied, some of them have more than one observation. The observations from HST have been carried out with the STIS (grating E230M) and HRS (grating G270M) instruments. The IUE observations are obtained in the high dispersion mode. Most of the stars have strong IR excesses, pointing out the existence of circumstellar disks. Stars cover a broad range of masses, but the most of them have ages of around 10^6 years (approximately the inner disk dispersal time).
Gomez de Castro Ana Ines
Lopez Martinez Fatima
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