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Hydrogen lines in LAMOST low resolution spectra of RR Lyrae stars

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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F. Yang, L. Deng, C.Liu, J. L. Carlin, H. Jo Newberg, K. Carrell, X. Zhang, Z. Bai
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F. Wang, H. Zhang, K. Wang, Y. Xin, Y. Xu, S. Gao, Y. Zhang, J. Li, Y Zhao

Solar and Stellar Astrophysics · Submitted 17 Jun 2013

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim In this sample, we successfully captured three RR Lyrae stars in the fast expansion phase, all of them showing significant hypersonic shock wave features in the spectra.

how it is stated · asserted 1.00 read the record →

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arXiv ID1306.3754 (version 2)
Pith IDXQTW2RKF, Pith's permanent record of this paper and its review
CitationC.Liu, F. Wang, F. Yang, H. Jo Newberg, H. Zhang, J. L. Carlin, J. Li, K. Carrell, K. Wang, L. Deng, S. Gao, X. Zhang, Y. Xin, Y. Xu, Y. Zhang, Y Zhao, Z. Bai. "Hydrogen lines in LAMOST low resolution spectra of RR Lyrae stars." arXiv:1306.3754 (2013). https://pith.science/paper/XQTW2RKF
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,059 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.16 · human participants 0.02 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.09 · mentions code or data availability 0.04.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

The LAMOST spectroscopic survey for Galactic structure and evolution has been in operation since October 2012, following a one-year pilot survey. The pilot survey produced a data release containing over 600,000 stellar spectra. By cross-checking with a large time series photometric database of RR Lyrae stars in high Galactic latitude regions, we found a total number of 157 stars that have been observed with LAMOST. In this sample, we successfully captured three RR Lyrae stars in the fast expansion phase, all of them showing significant hypersonic shock wave features in the spectra. By fitting the H{\alpha} line shape, we determine that the emission features seen within the broader H{\alpha} absorption line suggest hypersonic relative motions in the atmospheres of these three objects. With a further LAMOST survey of millions of stars, we will capture a large sample of RR Lyrae stars in their hypersonic expansion phase, and therefore provide a large database for the study of the internal structure and pulsation mechanism of RR Lyrae stars.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 The LAMOST spectroscopic survey for Galactic structure and evolution has been in operation since October 2012, following a one-year pilot survey. background 0.98 0.16 0.02 asserted 1.00
s1 The pilot survey produced a data release containing over 600,000 stellar spectra. background 0.98 0.27 0.02 asserted 1.00
s2 By cross-checking with a large time series photometric database of RR Lyrae stars in high Galactic latitude regions, we found a total number of 157 stars that have been observed with LAMOST. result 0.58 0.94 0.04 asserted 1.00
s3 In this sample, we successfully captured three RR Lyrae stars in the fast expansion phase, all of them showing significant hypersonic shock wave features in the spectra. result 0.99 0.96 0.32 asserted 1.00
s4 By fitting the H{\alpha} line shape, we determine that the emission features seen within the broader H{\alpha} absorption line suggest hypersonic relative motions in the atmospheres of these three objects. interpretation 0.46 0.96 0.33 hedged possibility 0.92
s5 With a further LAMOST survey of millions of stars, we will capture a large sample of RR Lyrae stars in their hypersonic expansion phase, and therefore provide a large database for the study of the internal structure and pulsation mechanism of RR Lyrae stars. future work 1.00 0.07 0.30 hedged possibility 0.48

What kind of paper the classifier reports this is: empirical study 0.99 · evidence from analysis of existing data 0.79.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

The LAMOST spectroscopic survey for Galactic structure and evolution has been in operation since October 2012, following a one-year pilot survey. The pilot survey produced a data release containing over 600,000 stellar spectra. By cross-checking with a large time series photometric database of RR Lyrae stars in high Galactic latitude regions, we found a total number of 157 stars that have been observed with LAMOST. In this sample, we successfully captured three RR Lyrae stars in the fast expansion phase, all of them showing significant hypersonic shock wave features in the spectra. By fitting the H{\alpha} line shape, we determine that the emission features seen within the broader H{\alpha} absorption line suggest hypersonic relative motions in the atmospheres of these three objects. With a further LAMOST survey of millions of stars, we will capture a large sample of RR Lyrae stars in their hypersonic expansion phase, and therefore provide a large database for the study of the internal structure and pulsation mechanism of RR Lyrae stars.

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Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

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