Multiplicity of the young O- and B-type stars in the Orion nebula cluster

Th. Preibisch, H. Zinnecker, G. Weigelt

Poster Contribution at the IAU Symposium 200 Birth and Evolution of Binary Stars

Potsdam, Germany, April 2000

Poster Proceedings Booklet, p. 106, (2000)


We present the results of a bispectrum speckle interferometric survey for binaries among the massive stars in the Orion Nebula cluster. Observations of 13 bright cluster members of spectral type O or B reveal 8 visual companions in total. Using the flux ratios of the resolved systems to estimate the masses of the companions, we find that the systems generally have mass ratios below 0.5. Extrapolation with correction for the unresolved systems suggests that there are at least 1.5 companions per primary star on average. This number is clearly higher than the corresponding number for low-mass primaries, suggesting that a different mechanism is at work in the formation of high-mass multiple systems than for low-mass multiple systems.

For detailed information see our recent paper on this project

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