Orbital motion of the massive multiple stars in the Orion Trapezium

Details Orbital motion of the massive multiple stars in the Orion Trapezium Orbital motion of the massive multiple stars in the Orion Trapezium

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...402..267s&link_type=abstract

Astronomy and Astrophysics, v.402, p.267-275 (2003)

Astronomy and Astrophysics

Astrophysics

36

Techniques: Interferometric, Stars: Individual: $\Theta^1{Ori

Scientific paper

We present bispectrum speckle interferometry of the multiple Orion Trapezium stars theta 1Ori A, theta 1Ori B, and theta 1Ori C obtained with the SAO 6 m telescope in Russia over a period of 5.5 years (epochs 1995-2001). Our diffraction-limited images have a resolution lambda /D of 42 mas (J-band), 57 mas (H-band) and 76 mas (K-band). We clearly detect motion of the companions relative to their primary stars in the systems theta 1Ori A1-2 (mean separation rho ~ 220 mas, change in position angle Delta PA = 6degr ), theta 1Ori B2-3 (rho ~ 205 mas, Delta PA = 8degr ), and theta 1Ori C1-2 (rho ~ 37 mas, Delta PA = 18degr ). In our K-band image of theta 1Ori B we resolve a fourth visual component, confirming its discovery by Simon et al. (\cite{Sim99}). We determine the J, H, and K magnitudes of the system components and estimate the stellar masses of the companions in the HR-diagram. The companions theta 1Ori C2 and theta 1Ori B2 show clear evidence of near-infrared excess in the color-color diagram. The companions theta 1Ori A2 and theta 1Ori B3 show much stronger extinction than their primary stars, providing evidence of the presence of circumstellar material around the companions.

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