盖亚数据中的共生双星。I. DR3和FPR中的已知共生星
Symbiotic binaries in the Gaia data. I. Known symbiotics in DR3 and FPR
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中文总结 AI 辅助
研究盖亚DR3和FPR中已知共生星的表现，通过交叉匹配数据检查多方面信息，评估其可靠性与有用性，发现天体测量数据可助搜索新系统，还给出初步轨道解等成果，为共生双星研究提供丰富数据集。
中文摘要 AI 辅助
共生星是由一颗演化的巨星和一个炽热致密伴星组成的长周期相互作用双星。其复杂光谱和变异性使其在天体物理学上有价值但观测具有挑战性。我们研究已知共生星在盖亚DR3和聚焦产品发布（FPR）中的表现，评估这些数据的可靠性，以及对候选分析和新系统搜索的有用性。我们将盖亚DR3和FPR与来自共生变量新在线数据库的已确认共生星进行交叉匹配，检查它们的天体测量、光度测量和光谱数据，以及诸如天体物理参数、轨道解、变异性特征和发射线分类等派生产品。天体测量数据可靠地限制了共生星在色-星等图中的位置，有助于新系统的搜索，而RUWE通常不是其双星性的可靠指标。大多数共生星在盖亚光度测量中是可变的。平均和历元径向速度以及推断的轨道解与文献大致一致，我们还为两个系统提供了首个初步轨道解。有效温度和金属丰度由于星云连续体和强发射线的污染而不可靠。几乎在所有共生星中都检测到Hα发射，使其成为一个可靠的诊断方法。此外，为两个系统识别出了解析伴星，一颗先前确认的共生星被重新分类为非共生星。盖亚DR3为共生双星的研究提供了丰富的数据集。即将到来的DR4因其更长的时间基线、新的数据产品和历元数据有望实现重大飞跃。
英文摘要
Symbiotic stars are long-period interacting binaries composed of an evolved giant and a hot compact companion. Their complex spectra and variability make them both astrophysically valuable and observationally challenging. We investigate how known symbiotic stars are represented in Gaia DR3 and the Focused Product Release (FPR), assess the reliability of these data, and evaluate their usefulness for candidate analysis and searches for new systems. We crossmatched Gaia DR3 and the FPR with confirmed symbiotic stars from the New Online Database of Symbiotic Variables and examined their astrometric, photometric, and spectroscopic data, along with derived products such as astrophysical parameters, orbital solutions, variability properties, and emission-line classifications. Astrometric data reliably constrain the position of symbiotics in the color-magnitude diagram, aiding searches for new systems, while RUWE is generally not a reliable indicator of their binarity. Most symbiotics are variable in Gaia photometry. Mean and epoch radial velocities, as well as inferred orbital solutions, are broadly consistent with the literature, and we provide the first tentative orbital solutions for two systems. Effective temperatures and metallicities are unreliable due to contamination from nebular continuum and strong emission lines. H$α$ emission is detected in nearly all symbiotics, making it a robust diagnostic. Additionally, resolved companions were identified for two systems, and one previously confirmed symbiotic star was reclassified as non-symbiotic. Gaia DR3 provides a rich dataset for the study of symbiotic binaries. The forthcoming DR4 promises a major leap forward with its longer time baseline, new data products, and epoch data.
