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NGC 1380 is a lenticular galaxy located near the centre of the Fornax Clusternortheast of NGC 1399. The globular cluster system of this galaxy waspreviously studied only from the ground. Recent studies of similar early-typegalaxies, specially lenticular ones, reveal the existence of star clusters thatapparently break up the traditional open/globular cluster dichotomy. Withhigher quality photometry from HST/WFPC2 we study the star clusters in NGC1380, measuring their magnitudes, colours, sizes and projected distances fromthe centre of the galaxy. We used deep archival HST/WFPC2 in the B and V bands.We built colour magnitude diagrams from which we selected a sample of clustercandidates. We also analysed their colour distribution and measured theirsizes. Based on their location in the luminosity-size diagram we estimatedprobabilities of them being typical globular clusters as those found in theGalaxy. A total of about 570 cluster candidates were found down to V=26.5. Wemeasured sizes for approximately 200 of them. The observed colour distributionhas three apparent peaks. Likewise for the size distribution. We identified thesmaller population as being mainly typical globular clusters, while the moreextended objects have small probabilities of being such objects. Differentcorrelations between absolute magnitudes, sizes, colours and location wereinferred for these cluster sub-populations. Most extended clusters (Reff > 4pc) share similar properties to the diffuse star clusters reported to inhabitluminous early-type galaxies in the Virgo galaxy cluster such as being of lowsurface brightness and fainter than MV ~ -8. We also report on a small group of(Reff ~ 10 pc), -8< MV < -6, red clusters located near the centre of NGC 1380,which may be interpreted as faint fuzzies.Comment: accepted for publication in A&

High resolution imaging of the early-type galaxy NGC 1380: an insight into the nature of extended extragalactic star clusters