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Both the stars are pulsating variables. The one at top-right is BO Car, an SRC-type variable and a red supergiant with a 0.8 magnitude amplitude and a period of about 131 days. The lower one is V515 Car, an SRB-type variable with the period irregular and undefined. The 'waviness' of both suggests that the spectra are simply reflecting the properties of these two stars, both being semi-regular pulsating variables, rather than being some particular issue with the photography! Beyond that.... I know nothing! Might be interesting to either chase up some spectra or spectral information on these stars, or attempt some better quality spectroscopy on them. Good work Al!
Cheers -
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