MERLIN and Global VLBI Observations of θ1 Orionis A

Details MERLIN and Global VLBI Observations of θ1 Orionis A MERLIN and Global VLBI Observations of θ1 Orionis A

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..259g&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

Astronomy and Astrophysics

Astronomy

4

Scientific paper

The Trapezium Cluster within the Orion Nebula is the richest and densest young stellar cluster known in our Galaxy. Early VLA observations revealed a wealth of compact radio sources, ranging from compact thermal emission, now known to be associated with the ``proplyds'', to highly variable non-thermal emission from a number of young, active stars, including θ1 Ori A, one of the Trapezium stars.
MERLIN 6cm observations have recently provided the most detailed radio images yet of the ionized gas, arising from photo-evaporation of protoplanetary disks (proplyds). Further, higher resolution radio observations may shed further light on the microjets and shock interactions, which are just beginning to be resolved in these images.
The astrometry provided by the MERLIN observations show that the radio emission from θ1 Ori A is most likely associated with a companion, now clearly identified by speckle interferometry. New Global VLBI observations, using phase referencing, confirm this position and show that the emission is easily detectable on transatlantic baselines. The emission may be marginally resolved with a fitted size of 1 mas, implying a brightness temperature of 108 K. The question of how such emission arises in what appears to be a 4-5 Msun pre-main-sequence star remains a puzzle.
Finally, we discuss the prospects for future VLBI astrometry of this companion star, which would allow the determination of the binary orbit, and well as the most accurate trigonometric parallax of the Trapezium cluster.

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