arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.02822astro-ph.IMastro-ph.GAastro-ph.SR
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GALAH巡天:观测综述和盖亚DR1伴星

The GALAH Survey: Observational Overview and Gaia DR1 companion

Sarah Martell, Sanjib Sharma, Sven Buder, Ly Duong, Katharine Schlesinger, Jeffrey Simpson, Karin Lind, Melissa Ness, Jonathan Marshall, Martin Asplund, Joss Bl… 展开作者

Sarah Martell, Sanjib Sharma, Sven Buder, Ly Duong, Katharine Schlesinger, Jeffrey Simpson, Karin Lind, Melissa Ness, Jonathan Marshall, Martin Asplund, Joss Bland-Hawthorn, Andrew Casey, Gayandhi De Silva, Ken Freeman, Janez Kos, Jane Lin, Daniel Zucker, Tomaz Zwitter, Borja Anguiano, Carlos Bacigalupo, Daniela Carollo, Luca Casagrande, Gary Da Costa, Jonathan Horner, Daniel Huber, Elaina Hyde, Prajwal Kafle, Geraint Lewis, David Nataf, Dennis Stello, Chris Tinney, Fred Watson, Rob Wittenmyer

摘要:

银河考古学与HERMES(GALAH)调查是一个大规模的观测项目,旨在追踪银河系的恒星形成,化学富集,恒星迁移和小型合并的历史。GALAH将利用英澳望远镜(AAT)的高效率和高分辨率多元素光谱仪(HERMES)拍摄的高分辨率(R $\simeq$ 28,000)光谱,确定多达100万颗恒星的恒星参数和多达29种元素的丰度。从由2 MASS、APASS和UCAC 4数据构建的颜色无偏目录中选择目标,我们预计将观察到0.3至3 kpc的矮星和1至10 kpc的巨星。这使得我们能够对银河系的薄盘和厚盘进行彻底的局部化学清查,并且还捕获了凸起和晕的较小样本。在本文中,我们介绍了截至2016年初GALAH调查观测的计划,过程和进展。在我们最初两年的巡天观测中,我们积累了这个分辨率下最大的高质量光谱数据集,超过20万颗恒星。我们还提出了第一个公开的GALAH数据目录:恒星参数(Teff,log(g),[Fe/H],[alpha/Fe]),径向速度,距离模量和红化的10680观测9860第谷-2星,可能包括在第一盖亚数据发布。

英文摘要:

The Galactic Archaeology with HERMES (GALAH) Survey is a massive observational project to trace the Milky Way's history of star formation, chemical enrichment, stellar migration and minor mergers. Using high-resolution (R$\simeq$28,000) spectra taken with the High Efficiency and Resolution Multi-Element Spectrograph (HERMES) instrument at the Anglo-Australian Telescope (AAT), GALAH will determine stellar parameters and abundances of up to 29 elements for up to one million stars. Selecting targets from a colour-unbiased catalogue built from 2MASS, APASS and UCAC4 data, we expect to observe dwarfs at 0.3 to 3 kpc and giants at 1 to 10 kpc. This enables a thorough local chemical inventory of the Galactic thin and thick disks, and also captures smaller samples of the bulge and halo. In this paper we present the plan, process and progress as of early 2016 for GALAH survey observations. In our first two years of survey observing we have accumulated the largest high-quality spectroscopic data set at this resolution, over 200,000 stars. We also present the first public GALAH data catalogue: stellar parameters (Teff, log(g), [Fe/H], [alpha/Fe]), radial velocity, distance modulus and reddening for 10680 observations of 9860 Tycho-2 stars that may be included in the first Gaia data release.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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