The emission-line spectrum of the hot R Coronae Borealis star MV SGR

Abstract

Spectra of MV Sgr obtained at CTIO in 1992 May show many emission lines in the red. Most of the emission lines show two components with a minimum centred at the stellar velocity. Species represented include H, HeI, TiII and FeII. Of special interest is emission in the LiI 6707-A resonance doublet. [OI] and [NII] emission indicate the presence of a nebula around the star. The radial velocity of the absorption lines (AlIII, SiIII, NII and CII) and FeII emission lines agrees with the radial velocity given by Jeffery et al.