J/AJ/152/213: Resource Record Summary

Resource Record Summary

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Interferometry and spectroscopy of sigma Orionis

Short name: J/AJ/152/213 IVOA Identifier: ivo://CDS.VizieR/J/AJ/152/213 DOI (Digital Object Identifier): 10.26093/cds/vizier.51520213 Publisher: CDS[+]ivo://CDS[Pub. ID] More Info: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/213 VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2017 Mar 06 13:27:23Z
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Description

We present interferometric observations of the {sigma} Orionis triple system using the CHARA Array, NPOI, and VLTI. Using these measurements, we spatially resolve the orbit of the close spectroscopic binary (Aa,Ab) for the first time and present a revised orbit for the wide pair (A,B). Combining the visual orbits with previously published radial velocity measurements and new radial velocities measured at CTIO, we derive dynamical masses for the three massive stars in the system of M_Aa_=16.99+/-0.20M_{Sun}_, M_Ab_=12.81+/-0.18M_{Sun}_, and M_B_=11.5+/-1.2M_{Sun}_. The inner and outer orbits in the triple are not coplanar, with a relative inclination of 120{deg}-127{deg}. The orbital parallax provides a precise distance of 387.5+/-1.3pc to the system. This is a significant improvement over previous estimates of the distance to the young {sigma} Orionis cluster.

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