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We have carried out a study of radio emission from a small sample of magneticO- and B-type stars using the Giant Metrewave Radio Telescope, with the goal ofinvestigating their magnetospheres at low frequencies. These are the lowestfrequency radio measurements ever obtained of hot magnetic stars. Theobservations were taken at random rotational phases in the 1390 and the 610 MHzbands. Out of the 8 stars, we detect five B-type stars in both the 1390 and the610 MHz bands. The O-type stars were observed only in the 1390 MHz band, and nodetections were obtained. We explain this result as a consequence of free-freeabsorption by the free-flowing stellar wind exterior to the closedmagnetosphere. We also study the variability of individual stars. One star - HD133880 - exhibits remarkably strong and rapid variability of its low frequencyflux density. We discuss the possibility of this emission being coherentemission as reported for CU Vir by Trigilio et al. (2000).

First detections of 610 MHz radio emission from hot magnetic stars