A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars
Hao Yang, Gregory J. Herczeg, Jeffrey L. Linsky, Alexander Brown,, Christopher M. Johns-Krull, Laura Ingleby, Nuria Calvet, Edwin Bergin, Jeff, A. Valenti

TL;DR
This paper provides a comprehensive FUV spectral atlas of 91 pre-main sequence stars, revealing correlations among emission lines and accretion indicators, and offering insights into star-disk interactions and accretion processes.
Contribution
It introduces a new FUV spectral atlas of T Tauri stars, highlighting correlations among emission lines and accretion diagnostics, and distinguishes accreting from non-accreting stars based on H2 emission.
Findings
Strong correlations among FUV emission lines and accretion luminosity.
H2 emission indicates active accretion in T Tauri stars.
FUV and optical diagnostics can estimate FUV fluxes from optical data.
Abstract
We present a far-ultraviolet (FUV) spectral atlas consisting of spectra of 91 pre-main sequence stars. Most stars in this sample were observed with the Space Telescope Imaging Spectrograph (STIS) and Advanced Camera for Surveys (ACS) on the \emph{Hubble Space Telescope} (\emph{HST}). We find strong correlations among the \ion{O}{1} 1304 triplet, %\ion{C}{2} 1335, the \ion{Si}{4} 1394/1403 doublet, the \ion{C}{4} 1549 doublet, and the \ion{He}{2} 1640 line luminosities. For classical T Tauri stars (CTTSs), we also find strong correlations between these lines and the accretion luminosity, suggesting that these lines form in processes related to accretion. These FUV line fluxes and X-ray luminosity correlate loosely with large scatters. The FUV emission also correlates well with H, H, and \ion{Ca}{2} K line luminosities.…
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