Large Proper Motions in the Young Low-Mass Protostellar System IRAS 16293-2422

Details Large Proper Motions in the Young Low-Mass Protostellar System IRAS 16293-2422 Large Proper Motions in the Young Low-Mass Protostellar System IRAS 16293-2422

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxaa..38...61l&link_type=abstract

Revista Mexicana de Astronomía y Astrofísica Vol. 38, pp. 61-69 (2002) (http://www.astroscu.unam.mx/~rmaa/)

Other

11

Astrometry, Binaries: General, Ism: Jets And Outflows, Stars: Formation

Scientific paper

We compare high angular resolution VLA 3.6-cm continuum observations of the protostellar system IRAS 16293-2422 obtained in 1989 and 1994, and show that the positions of the three VLA sources in IRAS 16293-2422 have changed significantly between the two epochs. The corresponding angular displacements are much larger than the parallax of those sources, and imply transverse velocities (10-30 km s-1) well above the Keplerian rotation speeds expected for those low-mass sources. The proper motions of two of the components appear to be very similar to one another, and to the proper motions of pre-main sequence stars in the same direction. We argue that they correspond to the overall proper motion of the small cloud (L1689N) harboring IRAS 16293-2422. The displacement of the third source, however, is larger and in a different direction. That component has previously been argued to be a shock between a partially ionized wind and the ambient medium, so some fast motions are not unexpected. It is somewhat puzzling, however, that the direction of the motion does not coincide with the direction of any of the known outflows powered by IRAS 16293-2422.

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