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V348 Sgr is simultaneously an active hot R Coronae Borealis (RCB) variable, apeculiar extreme helium star, and the hydrogen-deficient central star of aplanetary nebula. Explaining the RCB-type variability has been difficult sincethe star spends much of its time at minimum light. We present new ground-basedmulticolour photometry covering 5 observing seasons and 80 days of continuousphotometry from space. The latter demonstrate small-amplitude (< 0.01 mag.)variability at maximum light on timescales typical for strange-mode pulsationin hot helium supergiants. These could provide a trigger for frequentdust-production episodes; other mechanisms must also be considered.Multi-colour photometry probes the reddening properties of extinction eventsfrom minimum to maximum light. The latter are comparable with extinction eventsdue to carbonaceous grains seen in cooler RCB stars. Minimal reddening atminimum light is indicative that starlight scattered from circumstellar dustinto the line of sight dominates transmitted light.

ROAD and K2 photometry of V348 Sgr: probing the pulsation dust connection