Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars
Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars
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DOI：
10.3847/1538-4357/ac4266
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发表时间：
2021-12
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通讯作者：
R. Klement;G. Schaefer;D. Gies;L. Wang;D. Baade;T. Rivinius;A. Gallenne;A. Carciofi;J. Monnier;A. M'erand;N. Anugu;S. Kraus;C. Davies;C. Lanthermann;T. Gardner;P. Wysocki;J. Ennis;A. Labdon;B. Setterholm;J. L. Bouquin
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作者：
R. Klement;G. Schaefer;D. Gies;L. Wang;D. Baade;T. Rivinius;A. Gallenne;A. Carciofi;J. Monnier;A. M'erand;N. Anugu;S. Kraus;C. Davies;C. Lanthermann;T. Gardner;P. Wysocki;J. Ennis;A. Labdon;B. Setterholm;J. L. Bouquin
经典Be星是接近双星演化的可能产物，其中质量供体变成热的、剥离的O型或B型亚矮星（sdO/sdB），而质量获得者旋转并生长出一个圆盘，成为Be星。虽然已经确定了几个 Be+sdO 双星系统，但动力学质量和其他基本参数仅适用于单个 Be+sdO 系统，限制了与双星演化模型的对抗。在这项工作中，我们对三颗 Be 星（28 Cyg、V2119 Cyg 和 60 Cyg）的 sdO 伴星进行了直接干涉检测，所有这些都以前在紫外光谱中发现过。对于三个 Be+sdO 系统中的两个系统，我们展示了其组成部分的第一轨道和初步动力学质量，揭示其中一个可能是具有中子星伴星的 Be/X 射线双星的第一个被识别的前体。这些结果提供了一组新的基本参数，这些参数对于确定 Be 星的演化状态和起源至关重要。
Classical Be stars are possible products of close binary evolution, in which the mass donor becomes a hot, stripped O- or B-type subdwarf (sdO/sdB), and the mass gainer spins up and grows a disk to become a Be star. While several Be+sdO binaries have been identified, dynamical masses and other fundamental parameters are available only for a single Be+sdO system, limiting the confrontation with binary evolution models. In this work, we present direct interferometric detections of the sdO companions of three Be stars—28 Cyg, V2119 Cyg, and 60 Cyg—all of which were previously found in UV spectra. For two of the three Be+sdO systems, we present first orbits and preliminary dynamical masses of the components, revealing that one of them could be the first identified progenitor of a Be/X-ray binary with a neutron star companion. These results provide new sets of fundamental parameters that are crucially needed to establish the evolutionary status and origin of Be stars.