论文标题
WR147的无线电风车发出
A Radio Pinwheel Emanating from WR147
论文作者
论文摘要
狼射线（WR）恒星是进化的巨星，大概是进入超新星的路上。它们的特征是高发光性和快速而密集的恒星风。我们已经检测到与WR147相关的无线电连续链球车的迹象，WR147是富含氮气的WR恒星，具有光谱亚型WN8。这些结构周围是少数几个富含碳含量的WR星的众所周知的，这是在两种风中形成的尘埃，在该区域中形成的灰尘会产生与WR风一起执行的密集气体和灰尘。随着二进制系统旋转，形成了红外线中可检测到的阿基赛马螺旋。所得的风车包含有关风速，风能比率和轨道参数的信息。但是，WR147是WN恒星，灰尘的形成不太可能，因此必须使用不同的排放机制。我们对数据的分析表明，在这种情况下，发射主要具有非热的性质（同步性），尽管我们不能排除某些团块在自由发射中可能更明亮。与WN恒星相关的风车可能只能在无线电波长处作为非热发射器检测到。从风车的特征来看，我们估计二进制系统（WN8星和尚未直接被发现的同伴）的一段时间为1。7年。
Wolf-Rayet (WR) stars are evolved massive stars, presumably on their way to becoming supernova. They are characterized by high luminosities and fast and dense stellar winds. We have detected signs of a radio continuum pinwheel associated with WR147, a nitrogen-rich WR star with spectral subtype WN8. These structures are known around a handful of late-type carbon-rich WR stars with massive companions were the dust formed at the zone where the two winds collide produces a plume of dense gas and dust that is carried out with the WR wind. As the binary system rotates, an Archimedean spiral detectable in the infrared is formed. The resulting pinwheel contains information on wind speeds, wind-momentum ratio and orbital parameters. However, WR147 is a WN star and the formation of dust is unlikely so a different emission mechanism must be at work. Our analysis of the data suggests that in this case the emission is dominantly of non-thermal nature (synchrotron), although we cannot exclude that some clumps could be brighter in free-free emission. It is possible that the pinwheels associated with WN stars will be detectable only as non-thermal emitters at radio wavelengths. From the characteristics of the pinwheel we estimate a period of 1.7 years for the binary system (the WN8 star and a companion yet undetected directly) responsible for the pinwheel.
