用干涉测量重新审视共生双星。I. PIONIER档案汇编
Revisiting symbiotic binaries with interferometry. I. The PIONIER archival collection
AI总结：
本文利用VLTI/PIONIER干涉测量数据和Gaia距离重新分析六颗共生星，发现其红巨星均位于洛希瓣内，支持恒星风主导质量转移，并推断这些巨星可能处于渐近巨星支。
摘要：
共生星是研究双星系统中质量转移过程的特殊实验室。然而，从红巨星供体到致密吸积体（通常是白矮星，少数情况下为中子星）的质量转移主导机制仍不清楚。目前尚不确定它主要由恒星风、洛希瓣溢出还是两者共同驱动。虽然从自转速度或光谱型推断的半径表明洛希瓣填充因子较小，但许多共生系统中存在的椭球光变（推测由潮汐变形的巨星引起）却指向相反结论。对共生巨星进行干涉测量观测，并结合Gaia任务提供的距离测量，为解决这一矛盾提供了有前景的途径。在本系列的第一篇论文中，我们（重新）分析了六颗共生星的VLTI/PIONIER观测数据：AG Peg、FG Ser、ER Del、V1261 Ori、RW Hya和V399 Pav。除V399 Pav这一不确定情况外，我们发现这些系统中的巨星都远在其标准洛希瓣之内，即使在观测到椭球光变的V1261 Ori和RW Hya中也是如此。所有六颗星似乎都相当明亮，很可能位于渐近巨星支上，尽管不能排除其中一些处于第一红巨星支顶端。
英文摘要：
Symbiotic stars serve as exceptional laboratories for investigating mass transfer processes in binary systems. However, the dominant mechanism of mass transfer from the red giant donor to the compact accretor - typically a white dwarf or, in rare cases, a neutron star - remains unclear. It is uncertain whether it is driven primarily by the stellar wind, Roche-lobe overflow, or a combination of the two. While radii inferred from rotational velocities or spectral types suggest smaller Roche-lobe filling factors, the presence of ellipsoidal variability, presumably caused by tidally deformed giants in many symbiotic systems, indicates the opposite. Interferometric observations of symbiotic giants, combined with distance measurements provided by the Gaia mission, offer a promising avenue to resolve this discrepancy. In this first paper of the series, we (re)analyze VLTI/PIONIER observations of six symbiotic stars: AG Peg, FG Ser, ER Del, V1261 Ori, RW Hya, and V399 Pav. With the exception of the uncertain case of V399 Pav, we find that the giants in these systems remain well within their canonical Roche lobes, even in V1261 Ori and RW Hya, where ellipsoidal variability is observed. All six stars appear to be rather luminous and likely located on the asymptotic giant branch, although the possibility of some of them being at the tip of the first red giant branch cannot be ruled out.
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