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Observations of radio pulses from CU Virginis

Ravi, V. and Hobbs, G. and Wickramasinghe, D. and Champion, D. J. and Keith, M. and Manchester, R. N. and Norris, R. P. and Bray, J. D. and Ferrario, L. and Melrose, D. (2010) Observations of radio pulses from CU Virginis. Monthly Notices of the Royal Astronomical Society: Letters, 408 (1). L99-L103. ISSN 1745-3925.

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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.

Item Type:Article
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URLURL TypeDescription Paper
Ravi, V.0000-0002-7252-5485
Norris, R. P.0000-0002-4597-1906
Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 August 19. Received 2010 August 10; in original form 2010 July 6. We thank the referee, Ian Stevens, for many valuable suggestions. We are also grateful for the advice and insight of C. Trigilio on this Letter. 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. This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France. GH is supported by an Australian Research Council QEII Fellowship (project #DP0878388).
Funding AgencyGrant Number
Commonwealth of AustraliaUNSPECIFIED
Australian Research CouncilDP0878388
Subject Keywords:radiation mechanisms: non-thermal, stars: individual: CU Virginis, stars: magnetic field, stars: rotation, radio continuum: stars
Issue or Number:1
Record Number:CaltechAUTHORS:20190626-121728326
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Official Citation:V. Ravi, G. Hobbs, D. Wickramasinghe, D. J. Champion, M. Keith, R. N. Manchester, R. P. Norris, J. D. Bray, L. Ferrario, D. Melrose, Observations of radio pulses from CU Virginis, Monthly Notices of the Royal Astronomical Society: Letters, Volume 408, Issue 1, October 2010, Pages L99–L103,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96737
Deposited By: George Porter
Deposited On:26 Jun 2019 19:57
Last Modified:09 Mar 2020 13:19

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