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pre-main sequence — techniques

International Astronomical Union Colloquium (1)

International Astronomical Union (1)

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What Causes the Low Binary Frequency in the Orion Nebula Cluster?
R. Köhler
Journal:

International Astronomical Union Colloquium / Volume 191 / August 2004

Published online by Cambridge University Press:

22 February 2018, pp. 104-108

Print publication:

August 2004
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We report on the results of a binary survey in the outer parts of the Orion Nebula Cluster, 0.7 to 2 pc from the cluster center. The results should help to decide if the binary formation rate was lower in Orion than in Taurus-Auriga, or if many binaries formed initially, but were destroyed in close stellar encounters. We find that the binary frequency of low-mass stars does not depend on the distance to the cluster center. The companion star frequency of intermediate- to high-mass stars shows a trend to decrease with cluster radius, but the statistical significance of this trend is rather weak.