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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Spectropolarimetric study on circumstellar structure of microquasar LS I+61(circle) 303
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Spectropolarimetric study on circumstellar structure of microquasar LS I+61(circle) 303

机译：微小星体LS I + 61（圆）303的星际结构的光谱极化研究

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摘要

We present an optical linear spectropolarimetry study of the microquasar LS I +61 degrees 303. The continuum emission is mildly polarized (up to 1.3%) and shows almost no temporal change. We found a distinct change of polarization across the H alpha emission line, indicating the existence of a polarization component intrinsic to the microquasar. We estimated the interstellar polarization component from polarization of the H alpha line and derived the intrinsic polarization component. The wavelength dependence of the intrinsic component is well explained by Thomson scattering in an equatorial disk of a Be-type mass donor. The position angle (PA) of the intrinsic polarization is similar to 25 degrees, and represents the rotational axis of the Be disk. This PA is nearly perpendicular to the PA of a radio jet found during quiescent phases. Assuming an orthogonal disk-jet geometry around the compact star, the rotational axis of the accretion disk is almost perpendicular to that of the Be disk. Moreover, according to the orbital parameters of the microquasar, the compact star is likely to get across the Be disk around their periastron passage. We discuss the peculiar circumstellar structure of this microquasar inferred based on our observation, and suggest a possible connection with its high-energy activities.
机译：我们目前对微类星体LS I +61度303的光学线性光谱极化技术进行了研究。连续谱发射是轻度偏振的（高达1.3％），并且几乎没有时间变化。我们在整个H alpha发射线上发现了极化的明显变化，表明存在微类星体固有的极化分量。我们从H alpha线的极化估计了星际极化分量，并得出了本征极化分量。本征分量的波长依赖性可以通过Be型质量供体的赤道盘中的汤姆森散射很好地解释。本征极化的位置角（PA）类似于25度，代表Be盘的旋转轴。该功率放大器几乎垂直于静止阶段发现的射流的功率放大器。假设围绕紧凑恒星的圆盘喷射几何形状正交，则吸积盘的旋转轴几乎垂直于Be盘的旋转轴。此外，根据微类星体的轨道参数，致密星很可能绕其星体周围的轨道穿过Be盘。我们讨论了根据我们的观察推断出的这个微类星体的奇特的星际结构，并提出了与其高能量活动有关的可能。

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