SELECTING M GIANTS WITH INFRARED PHOTOMETRY: DISTANCES, METALLICITIES, AND THE SAGITTARIUS STREAM

SELECTING M GIANTS WITH INFRARED PHOTOMETRY: DISTANCES, METALLICITIES, AND THE SAGITTARIUS STREAM
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用红外光度测定法选择 m 个巨星:距离、金属丰度和人马座流

DOI:
10.3847/0004-637x/823/1/59
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发表时间:
2016-03
影响因子:
4.9
通讯作者:
Tian Hao
Tian Hao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li Jing;Smith Martin C.;Zhong Jing;Hou Jinliang;Carlin Jeffrey L.;Newberg Heidi Jo;Liu Chao;Chen Li;Li Linlin;Shao Zhengyi;Small Emma;Tian Hao

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使用光谱确认的M巨星,M矮星和类星体从LAMOST调查的样本,我们评估如何以及宽视场红外巡天探测器(WISE)和两微米全天巡天彩色切割可以用来选择M巨星。WISE带在分离M巨星和M矮星方面非常有效,我们提出了一个简单的分类,可以产生一个干净的和相对完整的M巨星样本。我们推导出一个新的光度关系来估计M巨星的金属丰度,使用APOGEE调查的数据进行校准。我们发现颜色和,几乎所有的散射是由于光度的不确定性之间的强相关性。我们发现,以前的光度距离关系,这主要是基于恒星模型,可能是有偏见的,并制定一个新的经验距离关系,调查趋势与金属丰度和星星形成的历史。基于这些关系,我们研究了人马座流中M巨星的性质。在轨道平面之间的领先和落后的尾巴的偏移是复制,并通过确定遥远的M巨星在银河系的反中心的方向,我们确认,以前检测到的碎片在外晕是远心的落后的尾巴。我们还发现了初步的证据,支持在银河系北方半球的前尾附近存在过密度,可能是尾尾的延伸(所谓的分支C)。我们已经测量了金属丰度分布沿着流,发现一个明确的金属丰度之间的领先和落后的尾巴,在协议模型的流形成。我们包括一个M巨人的在线表,以方便进一步的研究。
Using a spectroscopically confirmed sample of M giants, M dwarfs, and quasars from the LAMOST survey, we assess how well Wide-field Infrared Survey Explorer (WISE) and Two Micron All Sky Survey color cuts can be used to select M giant stars. The WISE bands are very efficient at separating M giants from M dwarfs, and we present a simple classification that can produce a clean and relatively complete sample of M giants. We derive a new photometric relation to estimate the metallicity for M giants, calibrated using data from the APOGEE survey. We find a strong correlation between the color and , where almost all of the scatter is due to photometric uncertainties. We show that previous photometric distance relations, which are mostly based on stellar models, may be biased and devise a new empirical distance relation, investigating trends with metallicity and star formation history. Given these relations, we investigate the properties of M giants in the Sagittarius stream. The offset in the orbital plane between the leading and trailing tails is reproduced, and by identifying distant M giants in the direction of the Galactic anticenter, we confirm that the previously detected debris in the outer halo is the apocenter of the trailing tail. We also find tentative evidence supporting an existing overdensity near the leading tail in the northern Galactic hemisphere, possibly an extension to the trailing tail (so-called Branch C). We have measured the metallicity distribution along the stream, finding a clear metallicity offset between the leading and trailing tails, in agreement with models for the stream formation. We include an online table of M giants to facilitate further studies.
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