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Paper: AB Dor Moving-Group Stars Resolved with the CHARA Array
Volume: 487, Resolving The Future Of Astronomy With Long-Baseline Interferometry
Page: 407
Authors: White, R. J.; Schaefer, G. H.; Boyajian, T.; Baines, E. K.; ten Brummelaar, T.; McAlister, H. A.; Ridgway, S. T.; Sturmann, J.; Sturmann, L.; Turner, N. H.; Farrington, C. D.; Goldfinger, P. J.
Abstract: We present results of a CHARA Array interferometric survey ofadolescent-age stars in the AB Dor Moving Group. The motivation is to spatially resolve stars larger than ∼ 0.4 milliarcseconds to help constrain the Group's age, and to search for close binary systems from which dynamical masses may be determined. This survey spatially resolved two members, the F6 star GJ 159 (0.600 +/- 0.014 mas; 2.3% precision) and the M2 star GJ 393 (0.552 +/- 0.014 mas; 2.5% precision). GJ 393 is especially interesting as comparisons with evolutionary models suggest that it is still pre-main sequence, and favor a young age (∼ 30 Myr) for the Moving Group. This survey also spatially resolved the known spectroscopic binary PX Vir. Additional observations of it, in combination with spectroscopic monitoring, will yield dynamical masses for a young sub-solar-mass binary in a few years' time.
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