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We present high angular resolution PdBI images (beam of ~0.33'') of theJ=27-26 line from several vibrational levels (v7=1 and v6=1) of HC3N towardCepheus A HW2. These images reveal the two main heating sources in the cluster:one centered in the disk collimating the HW2 radio jet (the HW2 disk), and theother associated with a hot core 0.3'' northeast HW2 (the HC). This is thefirst time that vibrationally excited emission of HC3N is spatially resolved ina disk. The kinematics of this emission shows that the HW2 disk rotatesfollowing a Keplerian law. We derive the temperature profiles in the twoobjects from the excitation of HC3N along the HW2 disk and the HC. Theseprofiles reveal that both objects are centrally heated and show temperaturegradients. The inner and hotter regions have temperatures of 350+-30K and270+-20K for the HW2 disk and the HC, respectively. In the cooler and outerregions, the temperature drops to 250+-30K in the HW2 disk, and to 220+-15K inthe HC. The estimated luminosity of the heating source of the HW2 disk is~2.2E4Lo, and 3000Lo for the HC. The most massive protostar in the HW2 regionis the powering source of the HW2 radio jet. We discuss the formation ofmultiple systems in this cluster. The proximity of the HC to HW2 suggest thatthese sources likely form a binary system of B stars, explaining the observedprecession of the HW2 radio jet.

Unveiling the main heating sources in the Cepheus A HW2 region