大尺度银河系考古学的SkyMapper恒星参数
SkyMapper stellar parameters for Galactic Archaeology on a grand-scale
摘要：
SkyMapper测光调查提供了南部天空数百万个光源的紫外线测光。我们使用DR1.1来探索其测光的质量，并开发了一种形式主义，使用恒星有效温度均匀化整个天空的零点。物理通量转换，和零点适合于此版本的推导，以及连接到恒星参数的颜色指数的关系。还介绍了无红化伪彩色和伪幅度。对于最适合银河系考古学的晚型恒星，我们表明SkyMapper+2 MASS能够在有效温度下提供优于100 K的精度（取决于过滤器），金属丰度高于-2的精度约为0.2dex，以及M-矮星和M-巨星之间的可靠区别。与天体测量和星震空间任务一起，SkyMapper有望成为恒星和银河系研究的宝库。
英文摘要：
The SkyMapper photometric surveys provides uvgriz photometry for several millions sources in the Southern sky. We use DR1.1 to explore the quality of its photometry, and develop a formalism to homogenise zero-points across the sky using stellar effective temperatures. Physical flux transformations, and zero-points appropriate for this release are derived, along with relations linking colour indices to stellar parameters. Reddening-free pseudo-colours and pseudo-magnitudes are also introduced. For late-type stars which are best suited for Galactic Archaeology, we show that SkyMapper+2MASS are able to deliver a precision better than 100K in effective temperatures (depending on the filters), ~0.2dex for metallicities above -2, and a reliable distinction between M-dwarfs and -giants. Together with astrometric and asteroseismic space mission, SkyMapper promises to be a treasure trove for stellar and Galactic studies.
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