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arXiv 1008.3592astro-ph.SRastro-ph.HE
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室女座CU射电脉冲的观测

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

备注：
Accepted by MNRAS Letters; 5 pages, 2 figures, 3 tables
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摘要：

室女座CU（英语：CU Virginis）是一个独特的天体物理实验室，研究恒星磁层和相干发射过程。它是已知的唯一一颗在每个自转周期都会发射无线电脉冲的主序星。本文报道了室女座CU在13和20厘米射电波段的脉冲轮廓的新观测结果。已知该轮廓的特征在于100 $\%$圆偏振发射的两个峰，这两个峰被认为是在电子回旋脉塞机制中产生的。我们发现尾峰在13和20 cm处都是稳定的，而首峰在13 cm处是间歇的。我们测量的脉冲到达时间证实了先前报道的光学数据和射电观测测量的假定恒星自转速率之间的差异。我们认为，这种周期差异可能是由一个未知的同伴或发射区的不稳定性。定期的长期脉冲定时和同时进行的多波长观测对于澄清这类新兴的瞬态射电源的行为至关重要。

英文摘要：

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 characterised by two peaks of 100$\%$ circularly polarised 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 multi-wavelength observations are essential to clarify the behaviour of this emerging class of transient radio source.

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