Fig. 1
Top panel: sample C iii 8664 Å emission line profiles for W239 clearly indicating the binary induced radial velocity shift relative to the systemic velocity (dashed line). Lorentzian profile fit to emission line as utilised for the radial velocity determination overplotted. Note the presence of an additional C iii emission feature in the blue wing at 8653.2 Å; this was found to have no effect on the RV determination.
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