Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-06
Astrophys.J. 627 (2005) L65-L68
Astronomy and Astrophysics
Astrophysics
13 pages, 3 figures
Scientific paper
10.1086/432052
We present absolute astrometry of the core of the Orion molecular cloud, made with Very Large Array archive data taken over the last two decades. Our analysis reveals that both the BN object and the radio source I have proper motions: the BN object has a proper motion of $12.6 \pm 0.6$ mas yr$^{-1}$ (corresponding to a velocity of $27 \pm 1$ km s$^{-1}$ at an adopted distance of 450 pc) to the northwest, while the radio source I has a proper motion of $5.6 \pm 0.7$ mas yr$^{-1}$ (corresponding to a velocity of $12 \pm 2$ km s$^{-1}$) to the southeast. The motion of the two sources is nearly antiparallel, diverging from a point in between them, where they were located about 500 years ago. These results suggest that the BN object and the radio source I were part of a multiple young stellar system that disintegrated in the recent past.
Allen Christine
Lizano Susana
Poveda Arcadio
Rodriguez Luis F.
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