论文标题
M81中使用GTC/Osiris中的狼射线星：7个新的检测，分析和分类
Wolf-Rayet stars in M81 using GTC/OSIRIS: 7 new detections, analysis and classification of the full sample
论文作者
论文摘要
我们报告了使用Gran Telescopio Canarias的Osiris仪器的多对象光谱仪，报告了M81中7个新的Wolf射线（WR）恒星位置的检测。这些检测是对较早研究的随访结果，该研究使用相同的仪器设置导致检测到14个WR位置。我们分析了21个光谱的整个样品，以使用与M81相似的金属性，使用WR恒星的模板光谱将它们分类为已知的WR子类型之一。考虑到给定的WR子类型的凸起强度的分散体，我们发现21个位置中的19个位置中有19个对应于单个恒星，包括所有7个新检测，sub类型：WNL，WNE，WCE，WCE和过渡性WN/c。这些检测都不对应于WCL或WO类型。这些恒星在红色凹凸与蓝色凹凸光度图中的位置与进化路径相符，根据Conti情景。基于此，我们将此图作为用于频谱分类的直接工具。 M81中单个WR恒星的检测为3.6 MPC的距离，为测试大型恒星进化模型的新环境打开了。
We report the detection of 7 new Wolf-Rayet (WR) star locations in M81 using the Multi-Object Spectrograph of the OSIRIS instrument at Gran Telescopio Canarias. These detections are the result of a follow-up of an earlier study using the same instrumental set-up that resulted in the detection of 14 WR locations. We analyse the entire sample of 21 spectra to classify them to one of the known WR sub-types using template spectra of WR stars in the Large Magellanic Cloud (LMC), with similar metallicity to M81. Taking into consideration the dispersion in the strengths of the bumps for a given WR sub-type, we found that 19 of the 21 locations correspond to individual stars, including all the 7 new detections, of sub-types: WNL, WNE, WCE and the transitional WN/C. None of the detections correspond to WCL or WO types. The positions of these stars in the red bump vs blue bump luminosity diagram agrees well with an evolutionary path according to the Conti scenario. Based on this, we propose this diagram as a straightforward tool for spectral classification of extragalactic WR sources. The detection of individual WR stars in M81, which is at a distance of 3.6 Mpc, opens up a new environment for testing the massive star evolutionary models.
