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CONTEXT: Until now, only one planetary nebula (PN) has been known in theFornax dwarf spheroidal galaxy. AIMS: The discovery of a second PN candidate,associated with one of the 5 globular clusters in the Fornax dwarf, isreported. METHODS: Spectra of the globular cluster H5, obtained with the UVESechelle spectrograph on the ESO Very Large Telescope, show [O III] lineemission at a radial velocity consistent with membership of the Fornax dwarf. Apossible counterpart of the [O III] emission is identified in archival imagesfrom the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. Thesource of the emission is located about 1.5" (less than one core radius)southwest of the centre of the cluster. RESULTS: The emission line source isidentified as a likely PN, albeit with several peculiar properties. No Hbeta,He I, or He II line emission is detected and the [O III]/Hbeta ratio is >25 (2sigma). The expansion velocity inferred from the [O III] 5007 AA line is about55 km/s, which is large for a PN. The diameter measured on the HST images isabout 0.23" or 0.15 pc at the distance of the Fornax dSph. CONCLUSIONS: Thisobject doubles the number of known PNe in Fornax, and is only the 5th PNassociated with an old GC for which direct imaging is available. It may be amember of the rare class of extremely H-deficient PNe, the second such casefound in a GC.

A peculiar planetary nebula candidate in a globular cluster in the Fornax dwarf spheroidal galaxy