Abstract
We used the US VLA to observe the chromospherically active binary UX Ari at five frequencies between 1.4 GHz and 15 GHz. During the period of observation, UX Ari was in a low state of activity with a luminosity of 6.6 ∼ 12.6 × 10 16 ergs −1 Hz −1. The low frequency end of the spectrum was rather flat, the high frequency end followed a power law, the degree of circular polarization was almost zero at the low frequency end and was medium strong (15%) at the high frequency end. The emission mechanism is possibly gyrosynchrotron, from which we estimate a magnetic field of a few to a few tens Gauss, a relativistic electron density of the order of 10 4 ∼ 10 2 cm −3, and a thermal electron density of 10 8 cm −3.
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