To reliably determine the main physical parameters (mass and age) of young stars we must know their distance. A precise determination of masses and ages is required to constrain the disk lifetime and can provide indications about the timescale of planet formation. While the average distance to nearby star-forming regions (< 200 pc) is often known, the distances to individual stars are usually unknown. Individual distances for members of co-moving groups of stars can be derived from their proper motions, radial velocities and the convergent point position of the moving group when the trigonometric parallax measured from the ground using optical telescopes is not accessible. However, a variant of the trigonometric parallax method using multi-epoch VLBI observations can also be successfully employed to measure very precise individual parallaxes. In this postdoctoral research project we propose to (i) investigate the kinematics and evolution of pre-main sequence stars in different star-forming regions and young associations within 200 pc, (ii) construct an online database for pre-main sequence and (iii) start a pilot study in radioastrometry dedicated to measure the distances of pre-main sequence stars.
News published in Agência FAPESP Newsletter about the scholarship: