Carbon Stars from LAMOST DR2 Data

Carbon Stars from LAMOST DR2 Data
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LAMOST DR2 数据中的碳星

DOI:
10.3847/0067-0049/226/1/1
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发表时间:
2016-06
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
Zhang Bo
Zhang Bo
中科院分区:
其他
文献类型:
--
作者:
Ji Wei;Cui Wenyuan;Liu Chao;Luo Ali;Zhao Gang;Zhang Bo

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在这项工作中,我们提出了新的目录的碳星从LAMOST DR 2目录。总共有894颗碳星是从恒星光谱测量的多条线指数中识别出来的。我们能够通过将红端的CN带与C2和其他线相结合来识别碳星。此外,我们还将碳星划分为C-H、C-R和C-N光谱亚型。这些子类型在多维线指数中显示出不同的特征,这意味着将来它们可以用于从更大的光谱数据集中识别碳星。虽然C-N星在线指数空间中与其他星明显分离,但我们发现C-R和C-H亚型之间没有明显的分离。C-R星和C-H星似乎从一个平稳地过渡到另一个。这可能暗示着C-R和C-H星的起源可能并不不同,相反,它们的光谱看起来不同是因为不同的金属丰度。由于相对较低的光谱分辨率和较低的信噪比,12 C/13 C的比值没有测量,因此无法识别C-J星。
In this work, we present the new catalog of carbon stars from the LAMOST DR2 catalog. In total, 894 carbon stars are identified from multiple line indices measured from the stellar spectra. We are able to identify the carbon stars by combining the CN bands in the red end with C2 and other lines. Moreover, we also classify the carbon stars into spectral sub-types of C-H, C-R, and C-N. These sub-types show distinct features in the multi-dimensional line indices, implying that in the future they can be used to identify carbon stars from larger spectroscopic data sets. While the C-N stars are clearly separated from the others in the line index space, we find no clear separation between the C-R and C-H sub-types. The C-R and C-H stars seem to smoothly transition from one to another. This may hint that the C-R and C-H stars may not be different in their origins, instead their spectra look different because of different metallicities. Due to the relatively low spectral resolution and lower signal-to-noise ratio, the ratio of 12C/13C is not measured and thus the C-J stars are not identified.
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