ORBITS, DISTANCE, and STELLAR MASSES of the MASSIVE TRIPLE STAR σ ORIONIS

G. H. Schaefer; C. A. Hummel; D. R. Gies; R. T. Zavala; J. D. Monnier; F. M. Walter; N. H. Turner; F. Baron; T. Ten Brummelaar; X. Che; C. D. Farrington; S. Kraus; J. Sturmann; L. Sturmann

doi:10.3847/0004-6256/152/6/213

ORBITS, DISTANCE, and STELLAR MASSES of the MASSIVE TRIPLE STAR σ ORIONIS

G. H. Schaefer
, C. A. Hummel
, D. R. Gies
, R. T. Zavala
, J. D. Monnier
, F. M. Walter
, N. H. Turner
, F. Baron
, T. Ten Brummelaar
, X. Che
, C. D. Farrington
, S. Kraus
, J. Sturmann
, L. Sturmann

Physics and Astronomy

Georgia State University
European Southern Observatory
United States Navy
University of Michigan, Ann Arbor
University of Exeter

Research output: Contribution to journal › Article › peer-review

74 Scopus citations

Abstract

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 = 16.99 ± 0.20 M_o, M_Ab = 12.81 ± 0.18 , and = 11.5 ± 1.2 M_o. The inner and outer orbits in the triple are not coplanar, with a relative inclination of -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.

Original language	English
Article number	213
Journal	Astronomical Journal
Volume	152
Issue number	6
DOIs	https://doi.org/10.3847/0004-6256/152/6/213
State	Published - Dec 2016

Keywords

binaries: spectroscopic
binaries: visual
stars: fundamental parameters
stars: individual (σ Orionis)
techniques: interferometric

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10.3847/0004-6256/152/6/213

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Schaefer, G. H., Hummel, C. A., Gies, D. R., Zavala, R. T., Monnier, J. D., Walter, F. M., Turner, N. H., Baron, F., Brummelaar, T. T., Che, X., Farrington, C. D., Kraus, S., Sturmann, J., & Sturmann, L. (2016). ORBITS, DISTANCE, and STELLAR MASSES of the MASSIVE TRIPLE STAR σ ORIONIS. Astronomical Journal, 152(6), Article 213. https://doi.org/10.3847/0004-6256/152/6/213

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title = "ORBITS, DISTANCE, and STELLAR MASSES of the MASSIVE TRIPLE STAR σ ORIONIS",

abstract = "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 = 16.99 ± 0.20 Mo, MAb = 12.81 ± 0.18 , and = 11.5 ± 1.2 Mo. The inner and outer orbits in the triple are not coplanar, with a relative inclination of -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.",

keywords = "binaries: spectroscopic, binaries: visual, stars: fundamental parameters, stars: individual (σ Orionis), techniques: interferometric",

author = "Schaefer, \{G. H.\} and Hummel, \{C. A.\} and Gies, \{D. R.\} and Zavala, \{R. T.\} and Monnier, \{J. D.\} and Walter, \{F. M.\} and Turner, \{N. H.\} and F. Baron and Brummelaar, \{T. Ten\} and X. Che and Farrington, \{C. D.\} and S. Kraus and J. Sturmann and L. Sturmann",

year = "2016",

month = dec,

doi = "10.3847/0004-6256/152/6/213",

language = "English",

volume = "152",

journal = "Astronomical Journal",

issn = "0004-6256",

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TY - JOUR

T1 - ORBITS, DISTANCE, and STELLAR MASSES of the MASSIVE TRIPLE STAR σ ORIONIS

AU - Schaefer, G. H.

AU - Hummel, C. A.

AU - Gies, D. R.

AU - Zavala, R. T.

AU - Monnier, J. D.

AU - Walter, F. M.

AU - Turner, N. H.

AU - Baron, F.

AU - Brummelaar, T. Ten

AU - Che, X.

AU - Farrington, C. D.

AU - Kraus, S.

AU - Sturmann, J.

AU - Sturmann, L.

PY - 2016/12

Y1 - 2016/12

N2 - 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 = 16.99 ± 0.20 Mo, MAb = 12.81 ± 0.18 , and = 11.5 ± 1.2 Mo. The inner and outer orbits in the triple are not coplanar, with a relative inclination of -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.

AB - 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 = 16.99 ± 0.20 Mo, MAb = 12.81 ± 0.18 , and = 11.5 ± 1.2 Mo. The inner and outer orbits in the triple are not coplanar, with a relative inclination of -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.

KW - binaries: spectroscopic

KW - binaries: visual

KW - stars: fundamental parameters

KW - stars: individual (σ Orionis)

KW - techniques: interferometric

UR - https://www.scopus.com/pages/publications/85009127102

U2 - 10.3847/0004-6256/152/6/213

DO - 10.3847/0004-6256/152/6/213

M3 - Article

AN - SCOPUS:85009127102

SN - 0004-6256

VL - 152

JO - Astronomical Journal

JF - Astronomical Journal

IS - 6

M1 - 213

ER -

ORBITS, DISTANCE, and STELLAR MASSES of the MASSIVE TRIPLE STAR σ ORIONIS

Abstract

Keywords

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