Using far-UV H2 fluorescent line ratios from HST ULLYSES spectra, the authors derive interstellar AV and RV for 34 classical T Tauri stars and find broad agreement with optical extinction measurements, with caveats from line self-absorption.
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Measurement of interstellar extinction for classical T Tauri stars using far-UV H2 line fluxes
Using far-UV H2 fluorescent line ratios from HST ULLYSES spectra, the authors derive interstellar AV and RV for 34 classical T Tauri stars and find broad agreement with optical extinction measurements, with caveats from line self-absorption.