Fig. 13
Spectra of red novae are compared to those of classical circumstellar O-rich envelopes: a pulsating AGB stars, Mira (o Ceti, spectrum is from APEX ESO archive); a red supergiant, VY CMa (Kamiński et al. 2013b); and a post-AGB object, OH231.8 (Rotten Egg Nebula) (Sabin et al. 2014). The spectrum of CK Vul is from Kamiński et al. (2017). The CO lines of Mira and CK Vul were trimmed for clarity.
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