The Multiple System θ^1 Ori C: an Analysis of Current Radial Velocity Data

Details The Multiple System θ^1 Ori C: an Analysis of Current Radial Velocity Data The Multiple System θ^1 Ori C: an Analysis of Current Radial Velocity Data

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010vsgh.conf..123l&link_type=abstract

Variable Stars, the Galactic halo and Galaxy Formation, Proceedings of an international conference held in Zvenigorod, Russia, 1

Astronomy and Astrophysics

Astrophysics

Scientific paper

The star θ^{1} Ori C is the youngest and nearest to us among O stars. It is the brightest star (V˜ 5) in the Trapezium cluster and is considered to be a multiple system where the main component is an oblique magnetic rotator. Parameters of the components of the system have not yet been investigated sufficiently, however. We present new radial-velocity measurements, a new hypothesis about the structure of the multiple system and new solutions for six spectroscopic orbits.
New radial velocities and data from literature have been analyzed by a cross-correlation function and pre-whitening methods and significant frequencies in the radial velocities were found.
From analysis of the measured radial-velocities we have got a strong evidence that θ^{1} Ori C is at least a triple system. The obtained frequencies correspond to periods of about 4000 d (10.95 y), 61 d, and 15.4 d which we assign to the orbit of the astrometric companion, close satellite and rotation of the primary, respectively. It follows from the analysis of the cross-correlation function that, probably, the system consists of three gravitationally connected and double runaway stars. The full version of the paper will be published in Astronomy & Astrophysics.

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