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We report the discovery of multiple condensations in the prestellar corecandidate SMM1A in the R~CrA cloud, which may represent the earliest phase ofcore fragmentation observed thus far. The separation between the condensationsis between 1000 and 2100 AU, and their masses range from about 0.1 to 0.2M_sun. We find that the three condensations have extremely low bolometricluminosities (< 0.1 L_sun) and temperatures (< 20 K), indicating that these areyoung sources that have yet to form protostars. We suggest that these sourceswere formed through the fragmentation of an elongated prestellar core. Ourresults, in concert with other observed protostellar binary systems withseparations in the scale of 1000 AU, support the scenario that promptfragmentation in the isothermal collapse phase is an efficient mechanism forwide binary star formation, while the fragmentation in the subsequent adiabaticphase may be an additional mechanism for close (< 100 AU) binary starformation.

R CrA SMM1A: Fragmentation in A Prestellar Core