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

Type Journal Article
Names G. N. Mace, L. Prato, G. Torres, L. H. Wasserman, R. D. Mathieu, I. S. McLean
Publication The Astronomical Journal
Volume 144
Pages 55
Journal Abbreviation The Astronomical Journal
Date August 1, 2012
DOI 10.1088/0004-6256/144/2/55;
ISSN 0004-6256
URL http://adsabs.harvard.edu/abs/2012AJ....144...55M
Library Catalog NASA ADS
Abstract The young, low-mass, triple system NTTS 155808-2219 (ScoPMS 20) was previously identified as a ~17 day period single-lined spectroscopic binary (SB) with a tertiary component at 0.21 arcsec. Using high-resolution infrared spectra, acquired with NIRSPEC on Keck II, both with and without adaptive optics (AO), we measured radial velocities (RVs) of all three components. Reanalysis of the single-lined visible light observations, made from 1987 to 1993, also yielded RV detections of the three stars. Combining visible light and infrared data to compute the orbital solution produces orbital parameters consistent with the single-lined solution and a mass ratio of q = 0.78 ± 0.01 for the SB. We discuss the consistency between our results and previously published data on this system, our RV analysis with both observed and synthetic templates, and the possibility that this system is eclipsing, providing a potential method for the determination of the stars' absolute masses. Over the ~20 year baseline of our observations, we have measured the acceleration of the SB's center of mass in its orbit with the tertiary. Long-term, AO imaging of the tertiary will eventually yield dynamical data useful for component mass estimates.
Tags BINARIES: SPECTROSCOPIC, Stars: Evolution, stars: pre-main sequence
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