The discovery of the coherent radio emission from CU Vir, that can be explained in terms of Electron Cyclotron Maser Emission, opens new prospectives in the field of the magnetic chemically peculiar stars.
An important question that can be put is: is the coherent radio emission at low frequency a common characteristic of the magnetic chemically peculiar stars? Low frequency observations of a sample of MCP stars that present a reversal magnetic field have to be carried out in order to answer this question. Such a survey will certainly put more stringent parameters to draw the physical mechanisms that act in the magnetosphere of the MCP stars.
Further observations on CU Vir are needed to confirm that the coherent radio emission here reported is stable in time. In particular, a continuous coverage with the rotational phase to better define the angular distribution of the coherent emission is crucial. Moreover, further observations covering several rotational periods are also needed to study the nature of the secondary peaks and to determine whether or not the phases at which they occur are truly random.
The bandwidth of the radiation is found to be larger than 80 MHz. Observations at frequency lower than 1400 MHz are needed to better define the spectrum.
© European Southern Observatory (ESO) 2000
Online publication: October 30, 19100