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The aim of this paper is to identify the young protostellar counterpartsassociated to dust millimeter cores of the Vela Molecular Ridge Cloud D throughnew IR observations (H_2 narrow-band at 2.12 micron and N broad band at 10.4micron) along with an investigation performed on the existing IR catalogues.The association of mm continuum emission with infrared sources from catalogues(IRAS, MSX, 2MASS), JHK data from the literature and new observations, has beenestablished according to spatial coincidence, infrared colours and spectralenergy distributions. Only 7 out of 29 resolved mm cores (and 16 out of the 26unresolved ones) do not exhibit signposts of star formation activity. The otherones are clearly associated with: far-IR sources, H_2 jets or near-IR objectsshowing a high intrinsic colour excess. The distribution of the spectralindices pertaining to the associated sources is peaked at values typical ofClass I objects, while three objects are signalled as candidates Class 0sources. We remark the high detection rate (30%) of H_2 jets driven by sourceslocated inside the mm-cores. They appear not driven by the most luminousobjects in the field, but rather by less luminous objects in young clusters,testifying the co-existence of both low- and intermediate-mass star formation.The presented results reliably describe the young population of VMR-D. However,the statistical evaluation of activity vs inactivity of the investigated cores,even in good agreement with results found for other star forming regions, seemsto reflect the limiting sensitivity of the available facilities rather than anyproperty intrinsic to the mm-condensations.

Near- and Far-Infrared Counterparts of Millimeter Dust Cores in the Vela Molecular Ridge Cloud D