2009A&A...497..195K


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST08:13:15

2009A&A...497..195K - Astronomy and Astrophysics, volume 497, 195-207 (2009/4-1)

Tracing the young massive high-eccentricity binary system θ1 Orionis C through periastron passage.

KRAUS S., WEIGELT G., BALEGA Y.Y., DOCOBO J.A., HOFMANN K.-H., PREIBISCH T., SCHERTL D., TAMAZIAN V.S., DRIEBE T., OHNAKA K., PETROV R., SCHOELLER M. and SMITH M.

Abstract (from CDS):

The nearby high-mass star binary system θ1 Ori C is the brightest and most massive of the Trapezium OB stars at the core of the Orion Nebula Cluster, and it represents a perfect laboratory to determine the fundamental parameters of young hot stars and to constrain the distance of the Orion Trapezium Cluster. By tracing the orbital motion of the θ1 Ori C components, we aim to refine the dynamical orbit of this important binary system. Between January 2007 and March 2008, we observed θ1 Ori C with VLTI/AMBER near-infrared (H- and K-band) long-baseline interferometry, as well as with bispectrum speckle interferometry with the ESO 3.6m and the BTA 6m telescopes (B'- and V'-band). Combining AMBER data taken with three different 3-telescope array configurations, we reconstructed the first VLTI/AMBER closure-phase aperture synthesis image, showing the θ1 Ori C system with a resolution of ∼2mas. To extract the astrometric data from our spectrally dispersed AMBER data, we employed a new algorithm, which fits the wavelength-differential visibility and closure phase modulations along the H- and K-band and is insensitive to calibration errors induced, for instance, by changing atmospheric conditions. Our new astrometric measurements show that the companion has nearly completed one orbital revolution since its discovery in 1997. The derived orbital elements imply a short-period (P≃11.3yr) and high-eccentricity orbit (e≃0.6) with periastron passage around 2002.6. The new orbit is consistent with recently published radial velocity measurements, from which we can also derive the first direct constraints on the mass ratio of the binary components. We employ various methods to derive the system mass (Msystem=44±7M) and the dynamical distance (d=410±20pc), which is in remarkably good agreement with recently published trigonometric parallax measurements obtained with radio interferometry.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: fundamental parameters - stars: individual: θ1 Orionis C - binaries: close - techniques: interferometric - stars: imaging

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 33833 * 05 12 48.1286065321 -06 03 25.875160860   6.867 5.892     G7III 40 0
2 * ups Ori V* 05 31 55.8601879 -07 18 05.537157 3.30 4.36 4.63 4.75 5.01 O9.7V 380 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1989 1
4 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 288 2
5 COUP 621 Y*O 05 35 14.35371 -05 22 32.8820           ~ 104 0
6 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
7 * tet01 Ori E SB* 05 35 15.7719090349 -05 23 09.890008011           G2IV 86 0
8 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 458 1
9 * tet01 Ori B Al* 05 35 16.112 -05 23 06.89 7.71 8.20 7.96     B1V 343 2
10 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1275 1
11 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1472 1
12 * tet01 Ori D Y*O 05 35 17.2574309230 -05 23 16.567215876 6.08 6.79 6.70 6.40 6.20 B1.5Vp 306 0
13 M 42 HII 05 35 17.3 -05 23 28           ~ 3732 0
14 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 857 0
15 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 852 1
16 HD 41547 gD* 06 05 27.0323181814 -10 14 33.340081297   6.219 5.874     F3V 41 0
17 HD 43023 RG* 06 13 54.2340549814 -03 44 28.937050074   6.753 5.833     K0III 63 0
18 HD 50281 PM* 06 52 18.0504546991 -05 10 25.366165190   7.64 6.57     K3.5V 175 0
19 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2212 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-08:13:15

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