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We report the discovery of intense, highly directional radio emission fromthe Bp star HD 35298, which we interpret as the consequence of ElectronCyclotron Maser Emission (ECME). The star was observed with the Giant MetrewaveRadio Telescope near the rotational phases of both magnetic nulls in band 4(550-750 MHz) and one of the nulls in band 5 (1060-1460 MHz). In band 4, weobserved flux density enhancement in both circular polarizations near bothmagnetic nulls. The sequences of arrival of the left and right circularlypolarized pulses are opposite near the two nulls. In band 5, we did not havecircular polarization information and hence measured only the total intensitylightcurve, which also shows enhancement around the magnetic null. The observedsequence of the circular polarization signs in band 4, compared with thelongitudinal magnetic field curve, is able to locate the hemisphere from whichECME arises. This observational evidence supports the scenario of ECME in theordinary mode, arising in a magnetosphere shaped like an oblique dipole. HD35298 is the most slowly rotating and most distant main sequence magnetic starfrom which ECME has been observed.

The fifth main sequence magnetic B-type star showing coherent radio emission: is this really a rare phenomenon?