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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Near-infrared spectra of 21 Wolf-Rayet stars: Wind clumping and mass-loss rates
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Near-infrared spectra of 21 Wolf-Rayet stars: Wind clumping and mass-loss rates

机译：21个Wolf-Rayet星的近红外光谱：风团聚和质量损失率

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摘要

We present 0.9-2.4 mu m spectra of 21 galactic Wolf-Rayet (WR) stars that were obtained by using an echelle spectrograph attached to the 1.5 m infrared telescope in Tokyo. The observed Wolf-Rayet stars contain 12 WNE, 3 WNL, and 6 WC stars. The near-infrared continuum spectra can be fitted by the superposition of stellar blackbody radiation with a stellar effective temperatures, T-* of 30-60 kK and free-free radiation from the stellar wind with an electron temperature, T-e, of similar to 15 kK. However, these calculated spectra show an excess at cm wavelength compared with the cm data for almost all stars. This may be interpreted by an infrared excess flux possibly due to the clumping of the stellar wind gas. Assuming an "enhancement factor" that depends on the distance from the center of the stars as similar to r(-omega), we can reproduce both our near-infrared spectra and the cm data by this clump-corrected free-free radiation with mass-loss rates similar to those derived by Nugis et al. On the other hand, we also estimated the mass-loss rates from our He I 1.083 and He II 1.012 fluxes without a consideration of clumping, although a more detailed consideration should be necessary in order to estimate more reliable values of the mass-loss rates from the He line fluxes.
机译：我们展示了21颗银河沃尔夫·雷耶（WR）星的0.9-2.4微米光谱，这些光谱是通过使用附在东京1.5 m红外望远镜上的阶梯光谱仪获得的。观测到的Wolf-Rayet星含有12个WNE，3个WNL和6个WC星。可以通过将恒星有效温度T- *设置为30-60 kK的恒星黑体辐射与电子温度Te近似为15的恒星风的自由自由辐射叠加来拟合近红外连续谱千千但是，与几乎所有恒星的厘米数据相比，这些计算得出的光谱在厘米波长处显示出过量。这可能是由于恒星风气的结块引起的红外线过量通量所解释。假设一个“增强因子”取决于离恒星中心的距离，类似于r（-omega），则我们可以通过质量经团块校正的自由-自由辐射来重现我们的近红外光谱和cm数据。损失率与Nugis等得出的相似。另一方面，我们还根据He I 1.083和He II 1.012通量估算了质量损失率，但没有考虑结块，尽管为了评估质量损失率的更可靠值，有必要进行更详细的考虑来自He线通量。

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