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Observations and modelling of pulsed radio emission from CU Virginis

Lo, K. K. and Bray, J. D. and Hobbs, G. and Murphy, T. and Gaensler, B. M. and Melrose, D. and Ravi, V. and Manchester, R. N. and Keith, M. J. (2012) Observations and modelling of pulsed radio emission from CU Virginis. Monthly Notices of the Royal Astronomical Society, 421 (4). pp. 3316-3324. ISSN 0035-8711.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Murphy, T.0000-0002-2686-438X
Gaensler, B. M.0000-0002-3382-9558
Ravi, V.0000-0002-7252-5485
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.
Funding AgencyGrant Number
Commonwealth of AustraliaUNSPECIFIED
Australian Postgraduate AwardUNSPECIFIED
Commonwealth Scientific and Research Organization (CSIRO)UNSPECIFIED
Australian Research CouncilDP0987072
Australian Research Council Centre of ExcellenceCE11E0090
Australian Research CouncilDP0878388
Science and Industry Endowment FundUNSPECIFIED
Subject Keywords:magnetic fields, radiation mechanisms: non‐thermal, stars: individual: CU Virginis, stars: rotation, radio continuum: stars
Issue or Number:4
Record Number:CaltechAUTHORS:20190625-125513494
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Official Citation:K. K. Lo, J. D. Bray, G. Hobbs, T. Murphy, B. M. Gaensler, D. Melrose, V. Ravi, R. N. Manchester, M. J. Keith, Observations and modelling of pulsed radio emission from CU Virginis, Monthly Notices of the Royal Astronomical Society, Volume 421, Issue 4, 21 April 2012, Pages 3316–3324,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96707
Deposited By: George Porter
Deposited On:26 Jun 2019 15:24
Last Modified:03 Oct 2019 21:24

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