澳大利亚SKA探路者射电星的圆偏振巡天
A circular polarisation survey for radio stars with the Australian SKA Pathfinder
摘要：
我们提出的结果，从圆偏振调查的射电星在快速ASKAP连续调查（RACS）。RACS是对$δ=+41^\circ$以南的整个天空进行的一次调查，使用的是澳大利亚平方公里阵列探路者望远镜（ASKAP），带宽为288兆赫，中心频率为887.5兆赫。我们分析的数据包括斯托克斯I和V偏振产品的RMS灵敏度为250 $μ$ Jy PSF $^{-1}$。我们搜索RACS的源与分数圆偏振超过6%，并排除成像伪影后，偏振泄漏，和已知的恒星，我们确定了无线电发射符合33个已知的恒星。这些范围从M型矮星到磁性的、化学性质特殊的A型和B型恒星。其中一些是著名的射电星，如YZ CMi和CU Vir，但23颗以前没有无线电探测。我们报告的流量密度和导出的亮度温度，这些检测和讨论的无线电发射的性质。我们还讨论了我们的研究结果的背景下，未来的ASKAP和平方公里阵列调查的射电星的人口统计的影响。
英文摘要：
We present results from a circular polarisation survey for radio stars in the Rapid ASKAP Continuum Survey (RACS). RACS is a survey of the entire sky south of $δ=+41^\circ$ being conducted with the Australian Square Kilometre Array Pathfinder telescope (ASKAP) over a 288 MHz wide band centred on 887.5 MHz. The data we analyse includes Stokes I and V polarisation products to an RMS sensitivity of 250 $μ$Jy PSF$^{-1}$. We searched RACS for sources with fractional circular polarisation above 6 per cent, and after excluding imaging artefacts, polarisation leakage, and known pulsars we identified radio emission coincident with 33 known stars. These range from M-dwarfs through to magnetic, chemically peculiar A- and B-type stars. Some of these are well known radio stars such as YZ CMi and CU Vir, but 23 have no previous radio detections. We report the flux density and derived brightness temperature of these detections and discuss the nature of the radio emission. We also discuss the implications of our results for the population statistics of radio stars in the context of future ASKAP and Square Kilometre Array surveys.
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