Observations of radio pulses from CU virginis

V. Ravi, G. Hobbs, D. Wickramasinghe, D. J. Champion, M. Keith, R. N. Manchester, R. P. Norris, J. D. Bray, L. Ferrario, D. Melrose

    Research output: Contribution to journalArticlepeer-review


    The magnetic chemically peculiar star CU Virginis is a unique astrophysical laboratory for stellar magnetospheres and coherent emission processes. It is the only known main-sequence star to emit a radio pulse every rotation period. Here we report on new observations of the CU Virginis pulse profile in the 13- and 20-cm radio bands. The profile is known to be characterized by two peaks of 100 per cent circularly polarized emission that are thought to arise in an electron-cyclotron maser mechanism. We find that the trailing peak is stable at both 13 and 20 cm, whereas the leading peak is intermittent at 13 cm. Our measured pulse arrival times confirm the discrepancy previously reported between the putative stellar rotation rates measured with optical data and with radio observations. We suggest that this period discrepancy might be caused by an unknown companion or by instabilities in the emission region. Regular long-term pulse timing and simultaneous multiwavelength observations are essential to clarify the behaviour of this emerging class of transient radio source. © 2010 The Authors. Journal compilation © 2010 RAS.
    Original languageEnglish
    Pages (from-to)L99-L103
    JournalMonthly Notices of the Royal Astronomical Society: Letters
    Issue number1
    Publication statusPublished - Oct 2010


    • Radiation mechanisms: non-thermal
    • Radio continuum: stars
    • Stars: individual: CU virginis
    • Stars: magnetic field
    • Stars: rotation


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