AI 中文总结
研究宽 sdO/B 双星三维轨道，通过 VLTI/GRAVITY 观测六个复合系统并空间分辨，给出投影物理间距及不确定度，结合其他观测信息可约束三维轨道，还识别出潜在第三组分，鼓励扩展样本以建立精确轨道和质量约束。
AI 中文摘要
热亚矮星（sdO/Bs）被广泛认为是双星演化的产物。其中很大一部分存在于与主序星（MS）伴星组成的长周期或宽双星（P>500 天）中，可能是由于稳定的质量转移过程，MS 伴星剥离了 sdO/B 前身星的氢包层。宽 sdO/B 双星是理解稳定质量转移的关键群体。长期光谱观测显示其轨道周期和偏心率范围适中，但组成恒星的质量约束不佳。本文首次开展长基线干涉测量活动观测宽 sdO/B + MS 双星，迈向确定其三维轨道和与模型无关的组成恒星质量。利用 VLTI/GRAVITY 观测六个复合 sdO/B + MS 系统并全部实现空间分辨，投影物理间距在 1 - 3 天文单位之间，不确定度在 1 - 8%。结合光谱或天体测量观测的补充信息，精确测量对约束这些系统的三维轨道至关重要。此外，还在 BD+10 2357 中识别出一个潜在的第三组分，不过确认还需更多数据。鉴于持续的光谱监测和即将发布的盖亚数据版本 4，强烈鼓励扩展此处的干涉测量样本，为这类关键的双星相互作用产物建立新的精确轨道和质量约束。
英文摘要
Hot subdwarf stars (sdO/Bs) are widely considered to be products of binary evolution. A significant fraction of them are found in long-period or wide binaries ($P>500$ d) with main sequence (MS) companions, likely resulting from a stable mass transfer episode where the MS companion stripped the hydrogen envelope of the sdO/B progenitor. Consequently, wide sdO/B binaries represent a key population in our pursuit of understanding stable mass transfer. They exhibit a modest range of orbital periods and eccentricities as revealed by long-term spectroscopic campaigns, though the component masses are not well constrained. In this Letter, we present the first long-baseline interferometry campaign to observe wide sdO/B + MS binaries and take the first step toward determining their 3-dimensional (3D) orbits and model-independent component masses. We target six composite sdO/B + MS systems with VLTI/GRAVITY and spatially resolve all of them. The projected physical separations range between $1-3$ au, with uncertainties between $1-8$%. When combined with complementary information from spectroscopic or astrometric observations, our precise measurements will be crucial to constrain 3D orbits for these systems. Additionally, we also identify a potential third component in BD+10 2357, although additional data will be necessary for confirmation. In light of continued spectroscopic monitoring and the imminent Gaia Data Release 4, we strongly encourage expanding the interferometric sample presented here to establish new, precise orbital and mass constraints for this key population of binary interaction products.
Comments8 pages, 8 figures. Accepted for publication in Astronomy & Astrophysics
