GALAH调查：科学动机
The GALAH Survey: Scientific Motivation
摘要：
GALAH巡天是一次大型的高分辨率光谱巡天，使用的是英澳望远镜上新安装的HERMES摄谱仪。HERMES摄谱仪在2度视场内同时提供了392颗恒星的四个通带的高分辨率（R ~ 28，000）光谱。调查的目标是解开银河系的形成和演化历史，使用古代恒星形成事件的化石遗迹，这些事件已经被破坏，现在分散在整个银河系中。化学标记试图仅根据其共同和独特的化学特征来识别这些分散的残留物;这些群体无法根据其空间、光度或运动学特性来识别。为了进行化学标记，GALAH巡天将获得100万颗V~14以下恒星的光谱。FGK星的HERMES光谱包含29种元素的吸收线，包括轻质子捕获元素、α元素、奇Z元素、铁峰元素和轻、重s过程和r过程的n捕获元素。本文介绍了GALAH调查的动机和计划执行，并介绍了一些结果的第一光的性能的HERMES。
英文摘要：
The GALAH survey is a large high-resolution spectroscopic survey using the newly commissioned HERMES spectrograph on the Anglo-Australian Telescope. The HERMES spectrograph provides high-resolution (R ~28,000) spectra in four passbands for 392 stars simultaneously over a 2 degree field of view. The goal of the survey is to unravel the formation and evolutionary history of the Milky Way, using fossil remnants of ancient star formation events which have been disrupted and are now dispersed throughout the Galaxy. Chemical tagging seeks to identify such dispersed remnants solely from their common and unique chemical signatures; these groups are unidentifiable from their spatial, photometric or kinematic properties. To carry out chemical tagging, the GALAH survey will acquire spectra for a million stars down to V~14. The HERMES spectra of FGK stars contain absorption lines from 29 elements including light proton-capture elements, alpha-elements, odd-Z elements, iron-peak elements and n-capture elements from the light and heavy s-process and the r-process. This paper describes the motivation and planned execution of the GALAH survey, and presents some results on the first-light performance of HERMES.
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