SIMBAD references

2016AJ....152..213S - Astron. J., 152, 213-213 (2016/December-0)

Orbits, distance, and stellar masses of the massive triple star σ Orionis.

SCHAEFER G.H., HUMMEL C.A., GIES D.R., ZAVALA R.T., MONNIER J.D., WALTER F.M., TURNER N.H., BARON F., TEN BRUMMELAAR T., CHE X., FARRINGTON C.D., KRAUS S., STURMANN J. and STURMANN L.

Abstract (from CDS):

We present interferometric observations of the σ 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 MAa = 16.99 ± 0.20 M☉, MAb = 12.81 ± 0.18 M☉, and MB = 11.5 ± 1.2 M☉. The inner and outer orbits in the triple are not coplanar, with a relative inclination of 120○-127○. The orbital parallax provides a precise distance of 387.5 ± 1.3 pc to the system. This is a significant improvement over previous estimates of the distance to the young σ Orionis cluster.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: spectroscopic - binaries: visual - stars: fundamental parameters - stars: individual: σ Orionis - techniques: interferometric - techniques: interferometric

VizieR on-line data: <Available at CDS (J/AJ/152/213): table3.dat table5.dat table6.dat table7.dat table8.dat>

Simbad objects: 48

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