CHAR阵列对共生星系统中演化成分的观测
CHARA Array Observations of the Evolved Components in Symbiotic Star Systems
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中文总结 AI 辅助
本研究利用CHARA阵列观测4个共生星及相关系统的冷巨星，结合光谱分析检验洛希瓣几何，发现3颗恒星有表面特征，3个系统充满因子低于1，为理解共生星质量转移机制提供观测依据。
中文摘要 AI 辅助
共生星中驱动质量转移的机制本质仍是恒星天文学中活跃的研究领域。限制恒星风与洛希瓣溢流在该过程中所起的作用，对于加深对这类双星系统的理解，并将其与再发新星、Ia型超新星等重要瞬变事件关联起来至关重要。光学干涉仪的高分辨率能力可分辨共生星中红巨星的几何结构，助力解答该问题。本研究利用高角分辨率天文中心（CHARA）阵列开展光学干涉测量研究，旨在测量4个共生星及相关系统中冷巨星的角直径并对其成像，报告了使用MIRC-X收集的H波段观测结果，采用模型拟合与图像重建检验洛希瓣充满几何结构，结合NASA红外望远镜设施（IRTF）的近红外光谱测定每个系统中冷巨星的基本恒星参数。参数拟合结果支持圆对称盘模型而非拉长几何结构，成像显示其中3颗恒星存在表面特征，我们发现3个轨道受约束的系统其推断的时间平均充满因子低于1。
英文摘要
The nature of the mechanisms that drive mass transfer in symbiotic stars remains an area of active research in stellar astronomy. Constraining the role that both stellar winds and Roche-lobe overflow play in this process is crucial to improving our understanding of these binaries and connecting them to important transient events such as recurrent novae and Type Ia supernovae. The high-resolution capabilities of an optical interferometer can resolve the geometric structure of the red giant in symbiotic stars and help answer this question. This work presents the results of an optical interferometric study using the Center for High Angular Resolution Astronomy (CHARA) Array for the purpose of measuring the angular diameter of and imaging the cool giant in four symbiotic and related systems. Here we report \textit{H} band observations collected with MIRC-X. Model fitting and image reconstruction are used to test for Roche-lobe-filling geometries. Near-simultaneous infrared spectroscopy taken using the NASA InfraRed Telescope Facility (IRTF) is used to determine the fundamental stellar parameters of the cool giant in each system. The parametric fits reported here favor circularly symmetric disk models over elongated geometries, while imaging suggests the presence of surface features on three of these stars. We find that the three systems with constrained orbits have inferred time-averaged filling factors below unity.
