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The multi-line slope method for the measure of the effective magnetic field of the cool stars: an application to the solar like cycle of {\epsilon} Eri

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C. Scalia, F. Leone, M. Gangi, M. Giarrusso, M. J. Stift

Solar and Stellar Astrophysics · Submitted 17 Aug 2017

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

The authors' main claim We show that the multi-line slope method is a fast alternative to the Least Squares Deconvolution (LSD) technique for the measurement of the effective magnetic fields of cool stars.

how it is stated · asserted 1.00 read the record →

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arXiv ID1708.05196 (version 1)
Pith IDYYDUXEOB, Pith's permanent record of this paper and its review
CitationC. Scalia, F. Leone, M. Gangi, M. Giarrusso, M. J. Stift. "The multi-line slope method for the measure of the effective magnetic field of the cool stars: an application to the solar like cycle of {\epsilon} Eri." arXiv:1708.05196 (2017). https://pith.science/paper/YYDUXEOB
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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,092 input tokens.

What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.10 · human participants 0.02 · controlled comparison 0.18 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.94 · mentions code or data availability 0.03.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

A method for the determination of integrated longitudinal stellar fields from low-resolution spectra is the so-called slope method, which is based on the regression of the Stokes V signal against the first derivative of Stokes I. Here we investigate the possibility to extend this technique to measure the magnetic fields of cool stars from high resolution spectra. For this purpose we developed a multi-line modification to the slope method, called multi-line slope method. We tested this technique by analysing synthetic spectra computed with the COSSAM code and real observations obtained with the high resolution spectropolarimeters Narval, HARPSpol and Catania Astrophysical Observatory Spectropolarimeter (CAOS). We show that the multi-line slope method is a fast alternative to the Least Squares Deconvolution (LSD) technique for the measurement of the effective magnetic fields of cool stars. Using a Fourier transform on the effective magnetic field variations of the star $\epsilon$ Eri, we find that the long term periodicity of the field corresponds to the 2.95 yr period of the stellar dynamo, revealed by the variation of the activity index.

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 A method for the determination of integrated longitudinal stellar fields from low-resolution spectra is the so-called slope method, which is based on the regression of the Stokes V signal against the first derivative of Stokes I. background 1.00 0.05 0.03 asserted 1.00
s1 Here we investigate the possibility to extend this technique to measure the magnetic fields of cool stars from high resolution spectra. contribution 0.83 0.39 0.03 hedged possibility 0.95
s2 For this purpose we developed a multi-line modification to the slope method, called multi-line slope method. contribution 0.71 0.94 0.05 asserted 1.00
s3 We tested this technique by analysing synthetic spectra computed with the COSSAM code and real observations obtained with the high resolution spectropolarimeters Narval, HARPSpol and Catania Astrophysical Observatory Spectropolarimeter (CAOS). method 0.98 0.96 0.04 asserted 0.93
s4 We show that the multi-line slope method is a fast alternative to the Least Squares Deconvolution (LSD) technique for the measurement of the effective magnetic fields of cool stars. result 0.88 0.89 0.65 asserted 1.00
s5 Using a Fourier transform on the effective magnetic field variations of the star $\epsilon$ Eri, we find that the long term periodicity of the field corresponds to the 2.95 yr period of the stellar dynamo, revealed by the variation of the activity index. result 0.99 0.96 0.20 asserted 1.00

What kind of paper the classifier reports this is: method or tool 1.00 · evidence from analysis of existing data 0.56.

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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

A method for the determination of integrated longitudinal stellar fields from low-resolution spectra is the so-called slope method, which is based on the regression of the Stokes V signal against the first derivative of Stokes I. Here we investigate the possibility to extend this technique to measure the magnetic fields of cool stars from high resolution spectra. For this purpose we developed a multi-line modification to the slope method, called multi-line slope method. We tested this technique by analysing synthetic spectra computed with the COSSAM code and real observations obtained with the high resolution spectropolarimeters Narval, HARPSpol and Catania Astrophysical Observatory Spectropolarimeter (CAOS). We show that the multi-line slope method is a fast alternative to the Least Squares Deconvolution (LSD) technique for the measurement of the effective magnetic fields of cool stars. Using a Fourier transform on the effective magnetic field variations of the star $\epsilon$ Eri, we find that the long term periodicity of the field corresponds to the 2.95 yr period of the stellar dynamo, revealed by the variation of the activity index.

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