寻找极端次矮星
Finding Extreme Subdwarfs
摘要：
我开发了一种新的技术来识别M型极端次矮星（esdMs），并证明它是比以前的方法更有效。我首先获得光谱和改进测光的样品54晚型晕候选人使用rNLTT减少自行（RPM）图。从光谱学，我发现其中四个是esdMs，其中三个是以前未知的。从改进的测光，我表明，所有四个谎言在一个狭窄的RPM走廊，只包含4个非esdMs。因此，通过良好的光度测定（即，没有光谱学），似乎可以选择具有50%esdM产率的esdM候选物。这比以前的方法效率高出一个数量级以上。
英文摘要：
I develop a new technique to identify M-type extreme subdwarfs (esdMs) and demonstrate that it is substantially more efficient than previous methods. I begin by obtaining spectroscopy and improved photometry of a sample of 54 late-type halo candidates using the rNLTT reduced proper motion (RPM) diagram. From spectroscopy, I find that four of these are esdMs, three of which were previously unknown. From the improved photometry, I show that all four lie in a narrow RPM corridor that contains only 4 non-esdMs. Hence, with good photometry (i.e., without spectroscopy), it appears possible to select esdM candidates with a 50% esdM yield. This is more than an order of magnitude more efficient than previous methods.
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