VLBA Detections in the Oph-S1 Binary System near Periastron Confirmation of its Orbital Elements and Mass

Jazmín Ordóñez-Toro, Sergio A. Dzib, Laurent Loinard +7

Oph-S1 is the most luminous and massive stellar member of the nearby Ophiuchus star-forming region. Previous Very Long Baseline Array (VLBA) observations have shown it to be an int…