M33星系中WNL星FSZ35的光谱研究
Spectral Study of the WNL Star FSZ35 in the M33 Galaxy
摘要：
研究和分析了M33中一颗异常的晚WN星FSZ 35的低分辨光谱。我们将其归类为富含氢的WN8恒星。利用辐射转移程序CMFGEN，我们确定了该天体的物理参数，并将它们与包括LBV星罗马诺星在内的其他WN8星在亮度最低时的参数进行了比较。与罗马诺的恒星不同，该物体在光谱和光度上都相当稳定，这可能归因于其更高级的进化阶段或较低的亮度。FSZ 35被证明拥有一个紧凑的星云，产生微弱但可检测到的[OIII]发射。这个物体与最近的星协相距很远（约100 pc），这表明它可能是另一个大质量逃逸恒星的例子。
英文摘要：
We study and analyse low-resolution spectra of the unordinary late WN star FSZ35 in M33. We classify the object as a hydrogen-rich WN8 star. Using the radiative transfer code CMFGEN, we determine the physical parameters of this object and compare them to the parameters of other WN8 stars including the LBV star Romano's star during the minimum of brightness. Unlike Romano's star, the object is fairly stable both spectrally and photometrically, that may be attributed to its more advanced evolutionary stage or lower luminosity. FSZ35 is shown to possess a compact nebula producing faint but detectable [OIII]emission. Location of this object at a large distance (about 100 pc) from the nearest association suggests the object may be one more example of a massive runaway star.
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