Query : 2010A&A...514A..34L

2010A&A...514A..34L - Astronomy and Astrophysics, volume 514, A34-34 (2010/5-1)

Θ1 Orionis C - a triple system?


Abstract (from CDS):

As the brightest star in the Trapezium cluster, Θ1OriC is the youngest and nearest to us among O-stars. It is considered to be a multiple system where the main component is an oblique magnetic rotator. Here, we aim at explaining the structure of the Θ1^ OriC system. We check for a new hypothesis about the presence of a third component and try to derive the corresponding orbital solutions and the absolute masses of the components. We measured new radial velocities (RVs) of Θ1 OriC and and combined them with data from literature. For the analysis, we used multiple frequency search and iterative calculations of orbits based on the method of differential corrections, applying successive prewhitening to the data in both methods.
Result. are compared with those obtained from speckle observations. We detected the impact of the known distant companion in the RVs of the primary and can now calculate a spectroscopic orbital solution that is consistent with the observed astrometric positions. We find evidence that Θ1 OriC is at least a triple system consisting of the primary, the known astrometric companion in a wide eccentric orbit with a period of 11yr, and a second companion in a close eccentric orbit with a period of 61.5d. We assign the additionally found period of 15.4d to the rotation of the primary, which is in a 1:4 resonance with the close orbit. Derived masses are 31M for the primary, 12M for the distant, and 1M for the close companion.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: general - stars: individual: Θ1OriC - binaries: spectroscopic - binaries: visual

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 472 1
2 * tet01 Ori B EB* 05 35 16.1339860056 -05 23 06.784444248 7.71 8.20 7.96     B1V 357 2
3 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1351 1
4 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1549 1

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