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Magnetic chemically peculiar (MCP) stars can present radio emission at centimetre wavelengths. The steep decre- ment of the dominant dipolar component of the photospheric magnetic field results in each radio frequency being mainly emitted in a well localised shell of the circumstellar region. To explore the most internal regions of the magnetosphere, observations of a sample of eleven MCP stars known to be radio sources in the 1.4−22.5 GHz range were carried out at 87.7 GHz with the IRAM interferometer. Millimeter emission, with a flux density at about 4× the sensitivity limit of our observations, was detected towards two of the stars: HD 35298 and HD 124224. Combining our mm-observations with previous cm-observations, it appears that MCP stars with a relativelyweak magnetic field present a radio spectrum that increases with frequency up to 22.5 GHz and then decreases towards the mm range. In presence of strong fields, the radio spectrum is always decreasing with frequency. A comparison of the observed cm-mm spectrum of HD 124224 with results of numerical simulations of the gyrosynchrotron emission suggests that circumstellar regions emitting in the mm-range cannot present magnetic fields larger than 1− 2k G.

Extending the radio spectrum of magnetic chemically peculiar stars to the mm range