The first data release of LAMOST low-resolution single-epoch spectra Article Swipe
Zhongrui Bai
,
Haotong Zhang
,
Hailong Yuan
,
Dongwei Fan
,
Boliang He
,
Ya-Juan Lei
,
Yiqiao Dong
,
Sicheng Yu
,
Yongheng Zhao
,
Yong Zhang
,
Yonghui Hou
,
Yaoquan Chu
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1088/1674-4527/21/10/249
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.1088/1674-4527/21/10/249
LAMOST Data Release 5, covering ∼17 000 deg 2 from –10° to 80° in declination, contains 9 million co-added low-resolution spectra of celestial objects, each spectrum combined from repeat exposure of two to tens of times during Oct 2011 to Jun 2017. In this paper, we present the spectra of individual exposures for all the objects in LAMOST Data Release 5. For each spectrum, the equivalent width of 60 lines from 11 different elements are calculated with a new method combining the actual line core and fitted line wings. For stars earlier than F type, the Balmer lines are fitted with both emission and absorption profiles once two components are detected. Radial velocity of each individual exposure is measured by minimizing χ 2 between the spectrum and its best template. The database for equivalent widths of spectral lines and radial velocities of individual spectra are available online. Radial velocity uncertainties with different stellar type and signal-to-noise ratio are quantified by comparing different exposure of the same objects. We notice that the radial velocity uncertainty depends on the time lag between observations. For stars observed in the same day and with signal-to-noise ratio higher than 20, the radial velocity uncertainty is below 5km s −1 , and increases to 10 km s −1 for stars observed in different nights.
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- Type
- preprint
- Language
- en
- Landing Page
- https://doi.org/10.1088/1674-4527/21/10/249
- OA Status
- green
- Cited By
- 1
- References
- 18
- Related Works
- 20
- OpenAlex ID
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Raw OpenAlex JSON
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https://openalex.org/W3175564607Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1088/1674-4527/21/10/249Digital Object Identifier
- Title
-
The first data release of LAMOST low-resolution single-epoch spectraWork title
- Type
-
preprintOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2021Year of publication
- Publication date
-
2021-11-01Full publication date if available
- Authors
-
Zhongrui Bai, Haotong Zhang, Hailong Yuan, Dongwei Fan, Boliang He, Ya-Juan Lei, Yiqiao Dong, Sicheng Yu, Yongheng Zhao, Yong Zhang, Yonghui Hou, Yaoquan ChuList of authors in order
- Landing page
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https://doi.org/10.1088/1674-4527/21/10/249Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
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https://arxiv.org/pdf/2106.12715Direct OA link when available
- Concepts
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LAMOST, Radial velocity, Physics, Spectral line, Stars, Astrophysics, Balmer series, Line (geometry), Noise (video), Emission spectrum, Spectral resolution, Astronomy, Mathematics, Geometry, Artificial intelligence, Computer science, Image (mathematics)Top concepts (fields/topics) attached by OpenAlex
- Cited by
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1Total citation count in OpenAlex
- Citations by year (recent)
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2022: 1Per-year citation counts (last 5 years)
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20Other works algorithmically related by OpenAlex
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