New Observations of the Large Proper Motions of Radio Sources in the Orion BN/KL Region

Details New Observations of the Large Proper Motions of Radio Sources in the Orion BN/KL Region New Observations of the Large Proper Motions of Radio Sources in the Orion BN/KL Region

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008rmxac..34...75r&link_type=abstract

IV Reunión sobre Astronomía Dinámica en Latino América (Eds. C. Allen, A. Ruelas, & R. Teixeira) Revista Mexicana de Astronomía

Astronomy and Astrophysics

Astronomy

Astrometry, Ism: Individual (Orion), Radio Continuum: Stars, Stars: Flare, Stars: Pre-Main Sequence

Scientific paper

We present absolute astrometry of four radio sources in the Becklin-Neugebauer/Kleinman-Low (BN/KL) region, derived from archival data (taken in 1991, 1995, and 2000) as well as from new observations (taken in 2006). All data consist of 3.6 cm continuum emission and were taken with the Very Large Array in its highest angular resolution A configuration. We confirm the large transverse velocities of the BN object, the radio source I (GMR I) and the radio counterpart of the infrared source n (Orion-n), with values from 15 to 26 km s^{-1}. The three sources are receding from a point between them from where they seem to have been ejected about 500 years ago, probably via the disintegration of a multiple stellar system. The radio source Orion-n appeared as a double in the first three epochs, but as single in 2006. The fourth source in the region, GMR D, shows no statistically significant motions. We also discuss briefly a dynamical scenario for the region.

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