天鹅座区域大质量早型星的兆赫兹辐射
Megahertz emission of massive early-type stars in the Cygnus region
摘要：
几十年来，大质量的早期型恒星一直被探测为射电源。它们的热成风辐射自由-自由连续体，在有碰撞风区域的双星系统中，也检测到了非热辐射。迄今为止，最丰富的数据是从高于1 GHz的频率收集的。我们在这里提出的结果，从325和610兆赫的观测，进行了巨大的米波射电望远镜，所有已知的沃尔夫-拉叶星和O-型恒星包含在面积约15平方度的天鹅座地区为中心。我们报告的检测11个大质量的恒星，包括沃尔夫-拉叶和O型系统。分米波长处测得的通量密度使我们能够研究双星系统的无线电频谱，并就影响这些物体宽带无线电发射的物理过程提出一致的解释。WR 140在610 MHz下被检测到，但在325 MHz下没有被检测到，很可能是因为自由-自由吸收的强烈影响。我们还报告-第一次-碰撞风双星系统的检测下降到150 MHz，属于WR 146系统，利用从TIFR GMRT巡天中提取的补充信息。它的光谱能量分布清楚地表明在约600 MHz的频率，我们解释为由于自由-自由吸收的营业额。最后，我们报告的两个额外的粒子加速碰撞风双星，即天鹅座OB 2 12和ALS 15108 AB的识别。
英文摘要：
Massive, early type stars have been detected as radio sources for many decades. Their thermal winds radiate free-free continuum and in binary systems hosting a colliding-wind region, non-thermal emission has also been detected. To date, the most abundant data have been collected from frequencies higher than 1 GHz. We present here the results obtained from observations at 325 and 610 MHz, carried out with the Giant Metrewave Radio Telescope, of all known Wolf-Rayet and O-type stars encompassed in area of ~15 sq degrees centred on the Cygnus region. We report on the detection of 11 massive stars, including both Wolf-Rayet and O-type systems. The measured flux densities at decimeter wavelengths allowed us to study the radio spectrum of the binary systems and to propose a consistent interpretation in terms of physical processes affecting the wide-band radio emission from these objects. WR 140 was detected at 610 MHz, but not at 325 MHz, very likely because of the strong impact of free-free absorption. We also report - for the first time - on the detection of a colliding-wind binary system down to 150 MHz, pertaining to the system of WR 146, making use of complementary information extracted from the TIFR GMRT Sky Survey. Its spectral energy distribution clearly shows the turnover at a frequency of about 600 MHz, that we interpret to be due to free-free absorption. Finally, we report on the identification of two additional particle-accelerating colliding-wind binaries, namely Cyg OB2 12 and ALS 15108 AB.
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