Deriving the extinction to young stellar objects using [FeII] near-infrared emission lines. Prescriptions from GIANO high-resolution spectra

Tommaso Pecchioli, Nicoletta Sanna, Fabrizio Massi +1

The near-infrared emission lines of Fe${}^{+}$ at 1.257, 1.321, and 1.644 $\mu$m share the same upper level; their ratios can then be exploited to derive the extinction to a line emitt…