Physics – Optics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998bsot.book.....p&link_type=abstract
Binary stars in the Orion Trapezium cluster: a high angular resolution near-infrared imaging study., by Petr, M. G.. Heidelberg
Physics
Optics
4
Scientific paper
The author studies the binary star content of the Orion Trapezium stellar cluster at a spatial resolution of 0.13″ FWHM, using the techniques of speckle holography and adaptive optics imaging. She analyses near-infrared images at λ = 2.2 μm, λ = 2.16 μm, λ = 1.65 μm of the ≡0.1 pc×0.1 pc cluster center, as well as images at λ = 2.2 μm of regions ≡0.2 - 0.3 pc from the center. Among 147 stars that are detected, 13 objects are identified as binaries or possible binaries, having projected separations between 0″11 and 1″11. The resulting frequency of low-mass pre-main-sequence binaries over the range of separations 59 - 500 AU is ≡7.5%±3.3%. This is lower by a factor of ≡3 than the frequency of the same type of stars observed in low-mass, low stellar density dark clouds. The Trapezium binary rate is consistent with field star binary frequencies within the uncertainties, supporting the hypothesis that most Galactic field stars were born in dense stellar clusters. In contrast to the low-mass stars, the OB stars in the author's sample show a high fraction of companions.
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