2008AJ....136.2238C

Star-forming regions are expected to show linear proper motions due to the relative motion of the Sun with respect to the region. These proper motions appear superposed to the proper motions expected in features associated with mass ejection from the young stellar objects embedded in them. Therefore, it is necessary to have good knowledge of the proper motion of the region as a whole in order to correctly interpret the motions associated with mass ejection. In this paper, we present the first direct measurement of proper motions of the NGC 1333 star-forming region. This region harbors one of the most studied Herbig-Haro systems, HH 7-11, whose exciting source remains unclear. Using Very Large Array A configuration data at 3.6 cm taken over 10 years, we have been able to measure the absolute proper motions of four thermal sources embedded in NGC 1333. From our results we have derived the mean proper motions of the NGC 1333 star-forming region to be µ_αcos δ = 9±1 mas/yr and µ_δ= -10±2 mas/yr. In this paper, we also discuss the possible implications of our results in the identification of the outflow exciting sources.