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The young, low-mass, triple system NTTS 155808-2219 (ScoPMS 20) waspreviously identified as a ~17-day period single-lined spectroscopic binarywith a tertiary component at 0.21 arcseconds. Using high-resolution infraredspectra, acquired with NIRSPEC on Keck II, both with and without adaptiveoptics, we measured radial velocities of all three components. Reanalysis ofthe single-lined visible light observations, made from 1987 to 1993, alsoyielded radial velocity detections of the three stars. Combining visible lightand infrared data to compute the orbital solution produces orbital parametersconsistent with the single-lined solution and a mass ratio of q = 0.78 +/- 0.01for the SB. We discuss the consistency between our results and previouslypublished data on this system, our radial-velocity analysis with both observedand synthetic templates, and the possibility that this system is eclipsing,providing a potential method for the determination of the stars' absolutemasses. Over the ~20 year baseline of our observations, we have measured theacceleration of the SB's center-of-mass in its orbit with the tertiary.Long-term, adaptive optics imaging of the tertiary will eventually yielddynamical data useful for component mass estimates.

Dynamical Measurements of the Young Upper Scorpius Triple NTTS 155808-2219