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We have carried out high-angular resolution (1.4") observations in thecontinuum at 3.1mm and in the N2H+ 1-0, CH3CN 5_k-4_k and 13CS 2-1 lines usingthe Plateau de Bure Interferometer (PdBI) towards the intermediate mass (IM)protostar IRAS21391+5802 (IC1396N). In addition, we have merged the PdBI imageswith previous BIMA (continuum data at 1.2mm and 3.1mm) and single-dish (N2H+1-0) data to have a comprehensive description of the region. The combination ofour data with BIMA and 30m data show that the bipolar outflow associated hascompletely eroded the initial molecular globule. The 1.2mm and 3.1mm continuumemissions are extended along the outflow axis tracing the warm walls of thebiconical cavity. Most of the molecular gas, however, is located in anelongated feature in the direction perpendicular to the outflow. A strongchemical differentiation is detected across the molecular toroid, with the N2H+1-0 emission absent in the inner region.This chemical differentiation can beunderstood in terms of the different gas kinetic temperature. The[CH3CN]/[N2H+] ratio increases by 5 orders of magnitude with gas temperature,for temperatures between 20K and 100K. The CH3CN abundance towards IRAM 2A, themost massive protostellar core, is similar to that found in hot corinos andlower than that expected towards IM and high mass hot cores. This couldindicate that IRAM 2A is a low mass or at most Herbig Ae star (IRAM 2A) insteadof the precursor of a massive Be star. Alternatively, the low CH3CN abundancecould also be the consequence of IRAM 2A being a Class 0/I transition objectwhich has already formed a small photodissociation region (PDR).

Dissecting an intermediate-mass (IM) protostar: Chemical differentiation in IC1396N