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We report far-IR Herschel observations obtained between 70 $\mu$m and 500$\mu$m of two star-forming dusty condensations, B1-bS and B1-bN, in the B1region of the Perseus star-forming cloud. In the Western part of the Perseuscloud, B1-bS is the only source detected in all of the 6 PACS and SPIREphotometric bands without being visible in the Spitzer map at 24 $\mu$m. B1-bNis clearly detected between 100 $\mu$m and 250 $\mu$m. We have fitted thespectral energy distributions of these sources to derive their physicalproperties, and find that a simple greybody model fails to reproduce theobserved SEDs. At least a two-component model, consisting of a central sourcesurrounded by a dusty envelope is required. The properties derived from thefit, however, suggest that the central source is not a Class 0 object. We thenconclude that while B1-bS and B1-bN appear to be more evolved than apre-stellar core, the best-fit models suggest that their central objects areyounger than a Class 0 source. Hence, they may be good candidates to beexamples of the first hydrostatic core phase. The projected distance betweenB1-bS and B1-bN is a few Jeans lengths. If their physical separation is closeto this value, this pair would allow the mutual interactions between twoforming stars at a very early stage of their evolution to be studied.

Herschel observations of B1-bS and B1-bN: two first hydrostatic core candidates in the Perseus star-forming cloud