对双星系统HD 327083及其气态与尘埃环境的新约束
New constraints on the binary system HD 327083 and its gaseous and dusty environments
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中文总结 AI 辅助
本研究结合多类观测数据，改进了B[e]双星HD 327083的轨道解，明确其成员星性质与环境结构，揭示其包含B型吸积星与F型伴星，周围存在分子环及椭圆形尘埃结构等特征。
中文摘要 AI 辅助
具有环双星分子环和尘埃环的双星系统极具研究价值，因为它们能为恒星系统的动力学与演化，以及周围物质的化学性质提供重要见解。本研究旨在阐明B[e]型双星系统HD 327083的本质，以及其星周包层与环双星包层的物理性质。研究结合了多历元高光谱分辨率光学和近红外观测、VLTI/MIDI观测以及ASAS-3测光数据，对这些数据进行分析以获取轨道参数、研究系统的成员星，并推导HD 327083复杂环境中的原子气体、分子气体及尘埃成分的性质。研究改进了HD 327083的轨道解，得出轨道周期P=107.699天；多数光学谱线在按轨道运动相位折叠后，呈现出形状与强度的变化；分别为冷、热成分确定了F6 II-III和B1的光谱型；一个分子气体环围绕该系统旋转，且随轨道相位变化；MIDI数据显示在9.7微米处存在硅酸盐吸收带，表明尘埃分布呈椭圆形，其内边缘随轨道相位在12.5至44天文单位之间变化。研究结论指出，B[e]型双星系统HD 327083包含一颗大质量的B型吸积星，以及一颗充满超过60%洛希瓣、正演化向红超巨星阶段的F型伴星；F型星的变形形态导致光变曲线出现宽极小值；热伴星温度为26000开尔文，表面重力加速度log g=3.0，被一个致密盘遮蔽并呈现双极外流；整个双星系统呈现富氧环境，被温暖的CO和SiO分子环包围，而这些分子环又被椭圆形尘埃结构包裹，所有这些成分均由演化中的供体星在向红超巨星阶段演化时形成。
英文摘要
Binary systems with circumbinary molecular and dust rings are of great interest because they provide insights into the dynamics and evolution of stellar systems and the chemistry of the surrounding material. We aim to elucidate the nature of the B[e] binary system HD 327083 and the physical properties of its circumstellar and circumbinary envelopes. We combined multi-epoch high-spectral resolution optical and near-IR observations with VLTI/MIDI observations and ASAS-3 photometry. The data were analysed to obtain the orbital parameters, study individual members of the system, and derive the properties of the atomic and molecular gas and the dusty components of the complex environment of HD 327083. We improved the orbital solution of HD 327083 and derived a period of P = 107.699 d. Most optical lines display variations in shape and intensity when folded with the orbital motion. We assigned F6 II-III and B1 spectral types respectively to the cool and hot components. A ring of molecular gas revolves around the system and varies with the orbital phase. The MIDI data show a silicate band in absorption at 9.7 micron and indicate that the dust distribution has an elliptical shape, with its inner edge varying with orbital phase between 12.5 and 44 AU. We conclude that the B[e] binary system HD 327083 comprises a B-type massive accreting star, and an F-type companion filling over 60% of its Roche lobe and evolving towards the red supergiant stage. The deformed shape of the F-type star causes a broad minimum in the light curve. The hot companion (26 000 K, log g = 3.0) is hidden by a compact disc and shows a bi-polar outflow. The entire binary system presents an O-rich environment. It is surrounded by warm CO and SiO molecular rings, which are enclosed by an elliptical dust structure. All these components were formed by the evolved donor star during its evolution towards the red supergiant phase.
