Paczyboski星AW UMa的径向速度图：不是接触双星
Radial velocity mapping of Paczyński's star AW UMa: Not a contact binary
摘要：
我们提出的二维（径向速度，轨道相位）光谱的结果，非常低的质量比密切的二进制AW UMa强烈表明，光谱质量比（q_sp = 0.10）不同意光度导出的一个，广泛采用的接触二进制模型似乎遇到严重的不一致性和局限性，这个对象。AW UMa与V566 Oph（q_sp = 0.26）进行了比较，我们发现V566 Oph的行为符合接触模型。观测到的AW UMa的增宽功能可以解释为一个非常强大的临边变暗和/或非固体主体旋转的主导主要组成部分;前一个假设是非物理的，而差分旋转不支持一个明显的稳定性本地化，黑暗的功能外侧的主要。有迹象表明，存在一个赤道带包围整个系统。所有的不足之处的解释和AW UMa的光度和光谱质量比之间的差异可以解决在一个新的模型AW UMa的两个组件被分离和系统被淹没在一个流的热，光学厚的物质，模仿恒星接触。虽然光谱学正确地给出了质量和它们的比例，但光度图像被赤道平面上吞没两颗恒星的物质严重修改。
英文摘要：
We present two-dimensional (radial velocity, orbital phase) spectroscopic results for the very low mass-ratio close binary AW UMa which strongly indicate that the spectroscopic mass ratio (q_sp = 0.10) does not agree with the photometrically derived one and that the widely adopted contact binary model appears to experience serious inconsistencies and limitations for this object. AW UMa is compared with V566 Oph (q_sp = 0.26) which we found to behave according to the contact model. Observed broadening functions of AW UMa can be interpreted by a very strong limb darkening and/or non-solid body rotation of the dominant primary component; the former assumption is unphysical while the differential rotation is not supported by an apparent stability of localized, dark features on the outer side of the primary. There are indications of the existence of an equatorial belt encompassing the whole system. All deficiencies in the interpretation and the discrepancy between the photometric and spectroscopic mass ratio of AW UMa can be solved within a new model of AW UMa where both components are detached and the system is submerged in a stream of hot, optically thick matter which mimics the stellar contact. While the masses and their ratio are correctly given by spectroscopy, the photometric picture is heavily modified by the matter engulfing both stars in the equatorial plane.
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