The region associated with IRAS 16293 - 2422 was observed at 20, 6, 2 and 1.3 cm with the VLA. The 2 cm monitoring shows no significant time variability over a scale of several hours to about a year. The sources in the region show no circular or linear polarization at a level of 10 percent. IRAS 16293 - 2442A has a spectral index of about 0.6 from 6 to 1.3 cm, a value consistent with an ionized outflow or with a partially optically thick H II region. IRAS 16293 - 2422B has a spectral index of about 2.1 between 6 and 2 cm and of about 3.2 between 2 and 1.3 cm. This last spectral index suggest that the 1.3 cm flux may have a contribution from dust emission.
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Estalella et al. (1991) studied this question.