[freebeard]

Spectroscopic observation of nova ejecta nebulae has shown that they are enriched in elements such as helium, carbon, nitrogen, oxygen, neon, and magnesium.[2] The contribution of novae to the interstellar medium is not great; novae supply only 1⁄50 as much material to the Galaxy as do supernovae, and only 1⁄200 as much as red giant and supergiant stars.[2]

en.wikipedia.org/wiki/Nova#Occurrence_rate_and_astrophysical_significanc e

There are world's of opportunity for events between a Coronal Mass Ejection and a Nova. And at least two probable causes.