arXiv 2001.082272020-01astro-ph.SRastro-ph.GA

400万颗LAMOST恒星五个核合成通道中Milky Way的丰度

Abundances in the Milky Way across five nucleosynthetic channels from 4 million LAMOST stars

Adam Wheeler, Melissa Ness, Sven Buder, Joss Bland-Hawthorn, Gayandhi De Silva, Michael Hayden, Janez Kos, Geraint F. Lewis, Sarah Martell, Sanjib Sharma, Jeffr… 展开作者

Adam Wheeler, Melissa Ness, Sven Buder, Joss Bland-Hawthorn, Gayandhi De Silva, Michael Hayden, Janez Kos, Geraint F. Lewis, Sarah Martell, Sanjib Sharma, Jeffrey D. Simpson, D. B. Zucker, Thomaž Zwitter

备注：: 17 pages + refs and appendices, to appear in ApJ. Data: https://doi.org/10.7910/DVN/5VWKMC
DOI：: 10.3847/1538-4357/ab9a46

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摘要：

大型恒星巡天观测揭示了银河系在广阔空间范围内的化学动力学结构。然而，迄今观察到的数百万低分辨率光谱尚未得到充分利用。我们采用大炮，数据驱动的方法来估计丰度，获得详细的丰度从低分辨率（R = 1800）LAMOST光谱，使用GALAH调查作为我们的参考。我们提供五个（对于矮星）或六个（对于巨星）估计丰度，代表五个不同的核合成通道，对于390万颗恒星，精度为0.05 - 0.23 dex。使用宽二进制对，我们证明了我们的丰度估计提供的化学鉴别能力超出了金属丰度。我们展示了我们的目录与径向，方位角和动态丰度图的覆盖范围，并检查整个磁盘和晕的中子俘获丰度，这表明原位和吸积晕人口的不同起源。LAMOST几乎完全覆盖了盖亚，并为整个银河系的化学提供了前所未有的视角。

英文摘要：

Large stellar surveys are revealing the chemodynamical structure of the Galaxy across a vast spatial extent. However, the many millions of low-resolution spectra observed to date are yet to be fully exploited. We employ The Cannon, a data-driven approach to estimating abundances, to obtain detailed abundances from low-resolution (R = 1800) LAMOST spectra, using the GALAH survey as our reference. We deliver five (for dwarfs) or six (for giants) estimated abundances representing five different nucleosynthetic channels, for 3.9 million stars, to a precision of 0.05 - 0.23 dex. Using wide binary pairs, we demonstrate that our abundance estimates provide chemical discriminating power beyond metallicity alone. We show the coverage of our catalogue with radial, azimuthal and dynamical abundance maps, and examine the neutron capture abundances across the disk and halo, which indicate different origins for the in-situ and accreted halo populations. LAMOST has near-complete Gaia coverage and provides an unprecedented perspective on chemistry across the Milky Way.

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