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'Main-sequence radio pulse-emitters' (MRPs) are magnetic early-type starsfrom which periodic radio pulses, produced via electron cyclotron maseremission (ECME), are observed. Despite the fact that these stars can naturallyoffer suitable conditions for triggering ECME, only seven such stars have beenreported so far within a span of more than two decades. In this paper, wereport the discovery of eight more MRPs, thus more than doubling the samplesize of such objects. These discoveries are the result of our sub-GHzobservation program using the Giant Metrewave Radio Telescope over the years2015-2021. Adding these stars to the previously known MRPs, we infer that atleast 32 percent of the magnetic hot stars exhibit this phenomenon, thussuggesting that observation of ECME is not a rare phenomenon. The significantlylarger sample of MRPs allows us for the first time to perform a statisticalanalysis comparing their physical properties. We present an empirical relationthat can be used to predict whether a magnetic hot star is likely to produceECME. Our preliminary analysis suggests that the physical parameters that playthe primary role in the efficiency of the phenomenon are the maximum surfacemagnetic field strength and the surface temperature. In addition, we presentstrong evidence of the influence of the plasma density distribution on ECMEpulse profiles. Results of this kind further motivate the search for MRPs as arobust characterization of the relation between observed ECME properties andstellar physical parameters can only be achieved with a large sample.

Discovery of eight 'Main-sequence Radio Pulse emitters' using the GMRT: clues to the onset of coherent radio emission in hot magnetic stars