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This article combines new CCD polarimetric data with previous informationabout protostellar objects in a search for correlations involving theinterstellar magnetic field. Specifically, we carried out an opticalpolarimetric study of a sample of 28 fields of 10 X 10 arcmin^2 located in theneighborhood of protostellar jets and randomly spread over the Galaxy. Thepolarimetry of a large number of field stars is used to estimate both theaverage and dispersion of the interstellar magnetic field (ISMF) direction ineach region. The results of the applied statistical tests are as follows.Concerning the alignment between the jet direction and the interstellarmagnetic field, the whole sample does not show alignment. There is, however, astatistically significant alignment for objects of Classes 0 and I. Regardingthe interstellar magnetic field dispersion, our sample presents values slightlylarger for regions containing T Tauri objects than for those harboring youngerprotostars. Moreover the ISMF dispersion in regions containing high-massobjects tends to be larger than in those including only low-mass protostars. Inour sample, the mean interstellar polarization as a function of the averageinterstellar extinction in a region reaches a maximum value around 3% for A(V)= 5, after which it decreases. Our data also show a clear correlation of themean value of the interstellar polarization with the dispersion of theinterstellar magnetic field: the larger the dispersion, the smaller thepolarization. Based on a comparison of our and previous results, we suggestthat the dispersion in regions forming stars is larger than in quiescentregions.

Correlating the interstellar magnetic field with protostellar jets and its sources