Observations and modelling of pulsed radio emission from CU Virginis
Abstract
We present 13 and 20 cm radio observations of the magnetic chemically peculiar star CU Virginis taken with the Australia Telescope Compact Array. We detect two circularly polarized radio pulses every rotation period which confirm previous detections. In the first pulse, the lower frequency emission arrives before the higher frequency emission and the ordering reverses in the second pulse. In order to explain the frequency dependence of the time between the two pulses, we construct a geometric model of the magnetosphere of CU Virginis, and consider various emission angles relative to the magnetic field lines. A simple electron cyclotron maser emission model, in which the emission is perpendicular to the magnetic field lines, is not consistent with our data. A model in which the emission is refracted through cold plasma in the magnetosphere is shown to have the correct pulse arrival time frequency dependence.
Additional Information
© 2012 The Authors Monthly Notices of the Royal Astronomical Society. © 2012 RAS. Accepted 2012 January 13. Received 2012 January 12; in original form 2011 June 23. The Australia Telescope Compact Array is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. KKL is supported by an Australian Postgraduate Award and a CSIRO OCE scholarship. KKL and BMG acknowledge the support of the Australian Research Council through grant DP0987072. The Centre for All‐sky Astrophysics is an Australian Research Council Centre of Excellence, funded by grant CE11E0090. GH is the recipient of an Australian Research Council QEII Fellowship (no. DP0878388). VR is the recipient of a John Stocker Postgraduate Scholarship from the Science and Industry Endowment Fund. KKL would like to thank Robert Braun for helpful discussions. We are grateful to Bernie Walp for performing one of our observations.Attached Files
Published - mnras0421-3316.pdf
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Additional details
- Eprint ID
- 96707
- Resolver ID
- CaltechAUTHORS:20190625-125513494
- Commonwealth of Australia
- Australian Postgraduate Award
- Commonwealth Scientific and Research Organization (CSIRO)
- DP0987072
- Australian Research Council
- CE11E0090
- Australian Research Council Centre of Excellence
- DP0878388
- Australian Research Council
- Science and Industry Endowment Fund
- Created
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2019-06-26Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field