AI 中文总结
该研究利用盖亚DR3 XP光谱训练混合密度网络，构建含650万颗主红团簇星的全天星表，校准盖亚视差零点偏移，为银河考古学提供重要资源。
AI 中文摘要
红团簇（RC）星是绘制银河系三维结构的极佳标准烛光。我们利用从盖亚（Gaia）DR3低分辨率XP光谱推断出的星震参数的光谱估计值，构建了包含650万颗主RC星的全天星表。我们在交叉匹配样本上训练了混合密度网络（MDN），该网络将每个343维的校正XP光谱映射到偶极重力模式的渐近周期间隔ΔΠ₁和大频率间隔Δν的估计值。我们利用这两个估计值筛选主RC星，发布了两个互补星表，分别由不同的参数空间切割和阈值定义：纯度达97%的高纯度Tier 1样本，包含532,189颗恒星；以及 completeness达86%的高完备性Tier 2样本，包含6,534,931颗恒星。两个星表均覆盖全天球，我们为所有恒星提供了距离和消光值。对于Tier 1 RC星，我们获得了6%的测光距离中值精度；利用所得距离，我们独立校准了盖亚（Gaia）DR3的视差零点偏移。Tier 2样本追踪的三维密度分布连续延伸至R≈25千秒差距（kpc），两个星表均公开可用。这些星表为银河考古学提供了宝贵资源，提供了均匀数据集以追踪银河系的化学动力学演化，并校准恒星族模型。
英文摘要
Red clump (RC) stars are excellent standard candles for mapping the three-dimensional structure of the Milky Way. We construct an all-sky catalog of 6.5 million primary RC stars using spectroscopic estimates of asteroseismic parameters inferred from Gaia DR3 low-resolution XP spectra. We train a mixture density network (MDN) on a cross-matched sample. The network maps each 343-dimensional corrected XP spectrum to estimates of $ΔΠ_{1}$, the asymptotic period spacing of dipole gravity modes, and $Δν$, the large frequency separation. We select primary RC stars using these two estimates. We release two complementary catalogs defined by different parameter-space cuts and thresholds: a high-purity Tier 1 sample of 532,189 stars with 97% purity and a high-completeness Tier 2 sample of 6,534,931 stars with 86% completeness. Both catalogs cover the full celestial sphere. We provide distances and extinction values for all stars. We obtain a median photometric distance precision of 6% for Tier 1 RC stars. Using the resultant distances, we independently calibrate the Gaia DR3 parallax zero-point offset. The three-dimensional density distribution traced by the Tier 2 sample extends continuously to $R\approx25$ kpc. Both catalogs are publicly available. These catalogs provide a valuable resource for Galactic archaeology, delivering a homogeneous dataset to trace the chemo-dynamical evolution of the Milky Way and to calibrate models of stellar populations.
Comments15 pages, 6 figures, 1 table. Catalogs available at https://nadc.china-vo.org/res/r101871/
