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We analyzed high angular resolution observations of the Very Large Arrayarchive at a wavelength of 7 mm of the L1551 IRS 5 binary system. Six sets ofobservations,five with the A configuration and one with the B configuration,were used, covering a time span of about 15 years. With these multi-epoch data,we estimated the absolute and relative proper motions of the binary system,which are about 25.1 mas/yr (~ 16.7 km/s considering a distance of 140 pc) and4.2 mas/yr, respectively. Finally, based on the relative proper motion, weestimated a total mass of the L1551 IRS 5 binary system of 1.7 Msun and anorbital period of 246 years.

Proper motions of L1551 IRS 5 binary system using 7 mm VLA observations