RT Journal Article
T1 Constraints to the magnetospheric properties of T Tauri stars - II. The Mg II ultraviolet feature
A1 López Martínez, Fátima
A1 Gómez De Castro, Ana Inés
AB The atmospheric structure of T Tauri stars (TTSs) and its connection with the large-scale outflow is poorly known. Neither the effect of the magnetically mediated interaction between the star and the disc is well understood. The Mg II multiplet is a fundamental tracer of TTSs atmospheres and outflows, and is the strongest feature in the near-ultraviolet spectrum of TTSs. The International Ultraviolet Explorer and Hubble Space Telescope data archives provide a unique set to study the main physical compounds contributing to the line profile and to derive the properties of the line formation region. The MgII profiles of 44 TTSs with resolution 13 000-30 000 are available in these archives. In this work, we use this data set to measure the main observables: flux, broadening, asymmetry, terminal velocity of the outflow, and the velocity of the discrete absorption components. For some few sources repeated observations are available and variability has been studied. There is a warm wind that at sub-au scales absorbs the blue wing of the MgII profiles. The main result found in this work is the correlation between the line broadening, MgII flux, terminal velocity of the flow and accretion rate. Both outflow and magnetospheric plasma contribute to the MgII flux. The flux-flux correlation between MgII and C IV or He II is confirmed; however, no correlation is found between the Mg II flux and the UV continuum or the H-2 emission.
PB Oxford University Press
SN 0035-8711
YR 2015
FD 2015-02
LK https://hdl.handle.net/20.500.14352/23002
UL https://hdl.handle.net/20.500.14352/23002
NO López Martínez, F. & Gómez De Castro, A. I. «Constraints to the Magnetospheric Properties of T Tauri Stars – II. The Mg Ii Ultraviolet Feature». Monthly Notices of the Royal Astronomical Society, vol. 448, n.o 1, marzo de 2015, pp. 484-501. DOI.org (Crossref), https://doi.org/10.1093/mnras/stu2690.
NO Ministerio de Economía, Comercio y Empresa (España)
DS Docta Complutense
RD 30 dic 2025