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Each of the nearby triple systems HIP 7601, 13498, 23824, and 113597 (HD10800, 18198, 35877, 217389) consists of solar-type dwarfs with comparablemasses, where all three components are resolved spectrally, while the outerpairs are resolved both visually and spectrally. These stars are relativelyyoung (between 100 and 600 Myr) and chromospherically active (X-ray sources),although they rotate slowly. Spectroscopic orbits of the inner subsystems(periods 19.4, 14.1, 5.6, 20.3 days) and orbits of the outer systems (periods1.75, 51, 27, 500 yrs, respectively) are determined. For HIP 7601 and 13498,the combined spectro-interferometric outer orbits produce direct measurement ofmasses of all components, allowing comparison with stellar models. The 6708Alithium line is present and its strength is measured in each componentindividually by subtracting the contributions of other components. The innerand outer orbits of HIP 7601 are nearly circular, likely co-planar, and have amodest period ratio of 1:33. This study contributes to the characterization ofhierarchical multiplicity in the solar neighborhood and provides data fortesting stellar evolutionary models and chronology.

Orbits of four young triple-lined multiple systems