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As part of the Herschel guaranteed time key program 'HOBYS', we present thephotometric survey of the star forming region Vela-C, one of the nearest sitesof low-to-high-mass star formation in the Galactic plane. Vela-C has beenobserved with PACS and SPIRE in parallel mode between 70 um and 500 um over anarea of about 3 square degrees. A photometric catalogue has been extracted fromthe detections in each band, using a threshold of 5 sigma over the localbackground. Out of this catalogue we have selected a robust sub-sample of 268sources, of which 75% are cloud clumps and 25% are cores. Their Spectral EnergyDistributions (SEDs) have been fitted with a modified black body function. Weclassify 48 sources as protostellar and 218 as starless. For two furthersources, we do not provide a secure classification, but suggest they are Class0 protostars.  From SED fitting we have derived key physical parameters. Protostellarsources are in general warmer and more compact than starless sources. Boththese evidences can be ascribed to the presence of an internal source(s) ofmoderate heating, which also causes a temperature gradient and hence a morepeaked intensity distribution. Moreover, the reduced dimensions of protostellarsources may indicate that they will not fragment further. A virial analysis ofthe starless sources gives an upper limit of 90% for the sourcesgravitationally bound and therefore prestellar. We fit a power law N(logM) propM^-1.1 to the linear portion of the mass distribution of prestellar sources.This is in between that typical of CO clumps and those of cores in nearbystar-forming regions. We interpret this as a result of the inhomogeneity of oursample, which is composed of comparable fractions of clumps and cores.

The Herschel view of the on-going star formation in the Vela-C molecular cloud