The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1–C8 and C10

DOI：

10.3847/1538-4357/ac2c83

发表时间：

2021-08

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Zinn;D. Stello;Y. Elsworth;R. A. Garc'ia;T. Kallinger;S. Mathur;B. Mosser;M. Hon;L. Bugnet-L.-Bu

我们为C1-C8和C10-C18战役提供了K2银河考古计划（K2 GAP）的第三次也是最后一次数据发布。我们提供了约19，000颗红巨星的星震半径和质量系数κ R和κ M，它们直接转化为给定温度的半径和质量。因此，K2 GAP DR 3代表了迄今为止文献中最大的星震样本。K2 GAP DR 3恒星参数被校准为基于盖亚DR 2的绝对视差尺度，通过机器学习方法提供红巨星分支和红团演化状态分类。结合这些恒星参数与GALAH DR 3光谱，我们确定小行星地震年龄的精度为1.20%-30%，并比较年龄-丰度关系的α，轻，铁峰和中子捕获元素的低和高α种群之间的银河系化学演化模型。我们证实了最近文献中的迹象，即在银河系晚期增加了Ba的生产，以及与下列因素相关的瞬发来源对r过程富集的重大贡献，例如，核心坍缩的超新星着眼于其他银河考古学应用，我们使用注入测试表征K2 GAP DR 3的不确定性和完整性，表明K2 GAP DR 3在质量/年龄方面基本上是无偏的，不确定性为2.9%（统计）。± 0.1%（系统）和6.7%（统计）± 0.3%（系统）在红巨星分支星的κ R和κ M中的平均值为4.7%（统计）。± 0.3%（系统）11%（统计）± 0.9%（系统）红色星团的恒星。我们还确定了百分比级别的小行星地震系统性，这可能与基础数据的时间基线相关，因此应该在TESS小行星地震分析中考虑。

We present the third and final data release of the K2 Galactic Archaeology Program (K2 GAP) for Campaigns C1–C8 and C10–C18. We provide asteroseismic radius and mass coefficients, κ R and κ M , for ∼19,000 red giant stars, which translate directly to radius and mass given a temperature. As such, K2 GAP DR3 represents the largest asteroseismic sample in the literature to date. K2 GAP DR3 stellar parameters are calibrated to be on an absolute parallactic scale based on Gaia DR2, with red giant branch and red clump evolutionary state classifications provided via a machine-learning approach. Combining these stellar parameters with GALAH DR3 spectroscopy, we determine asteroseismic ages with precisions of ∼20%–30% and compare age-abundance relations to Galactic chemical evolution models among both low- and high-α populations for α, light, iron-peak, and neutron-capture elements. We confirm recent indications in the literature of both increased Ba production at late Galactic times as well as significant contributions to r-process enrichment from prompt sources associated with, e.g., core-collapse supernovae. With an eye toward other Galactic archeology applications, we characterize K2 GAP DR3 uncertainties and completeness using injection tests, suggesting that K2 GAP DR3 is largely unbiased in mass/age, with uncertainties of 2.9% (stat.) ± 0.1% (syst.) and 6.7% (stat.) ± 0.3% (syst.) in κ R and κ M for red giant branch stars and 4.7% (stat.) ± 0.3% (syst.) and 11% (stat.) ± 0.9% (syst.) for red clump stars. We also identify percent-level asteroseismic systematics, which are likely related to the time baseline of the underlying data, and which therefore should be considered in TESS asteroseismic analysis.

The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1–C8 and C10–C18

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