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Article: The RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks

TitleThe RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks
Authors
KeywordsGalaxy: Abundances
Galaxy: stellar content
Methods: data analysis
Stars: Abundances
Techniques: spectroscopic
Issue Date16-Dec-2020
PublisherEDP Sciences
Citation
Astronomy & Astrophysics, 2020, v. 644 How to Cite?
AbstractContext. Data-driven methods play an increasingly important role in the field of astrophysics. In the context of large spectroscopic surveys of stars, data-driven methods are key in deducing physical parameters for millions of spectra in a short time. Convolutional neural networks (CNNs) enable us to connect observables (e.g. spectra, stellar magnitudes) to physical properties (atmospheric parameters, chemical abundances, or labels in general).Aims. We test whether it is possible to transfer the labels derived from a high-resolution stellar survey to intermediate-resolution spectra of another survey by using a CNN.Methods. We trained a CNN, adopting stellar atmospheric parameters and chemical abundances from APOGEE DR16 (resolution R=22 500) data as training set labels. As input, we used parts of the intermediate-resolution RAVE DR6 spectra (R similar to 7500) overlapping with the APOGEE DR16 data as well as broad-band ALL_WISE and 2MASS photometry, together with Gaia DR2 photometry and parallaxes.Results. We derived precise atmospheric parameters T-eff, log(g), and [M/H], along with the chemical abundances of [Fe/H], [alpha /M], [Mg/Fe], [Si/Fe], [Al/Fe], and [Ni/Fe] for 420 165 RAVE spectra. The precision typically amounts to 60 K in T-eff, 0.06 in log(g) and 0.02-0.04 dex for individual chemical abundances. Incorporating photometry and astrometry as additional constraints substantially improves the results in terms of the accuracy and precision of the derived labels, as long as we operate in those parts of the parameter space that are well-covered by the training sample. Scientific validation confirms the robustness of the CNN results. We provide a catalogue of CNN-trained atmospheric parameters and abundances along with their uncertainties for 420 165 stars in the RAVE survey.Conclusions. CNN-based methods provide a powerful way to combine spectroscopic, photometric, and astrometric data without the need to apply any priors in the form of stellar evolutionary models. The developed procedure can extend the scientific output of RAVE spectra beyond DR6 to ongoing and planned surveys such as Gaia RVS, 4MOST, and WEAVE. We call on the community to place a particular collective emphasis and on efforts to create unbiased training samples for such future spectroscopic surveys.
Persistent Identifierhttp://hdl.handle.net/10722/341924
ISSN
2023 Impact Factor: 5.4
2023 SCImago Journal Rankings: 1.896
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGuiglion, G-
dc.contributor.authorMatijevic, G-
dc.contributor.authorQueiroz, ABA-
dc.contributor.authorValentini, M-
dc.contributor.authorSteinmetz, M-
dc.contributor.authorChiappini, C-
dc.contributor.authorGrebel, EK-
dc.contributor.authorMcMillan, PJ-
dc.contributor.authorKordopatis, G-
dc.contributor.authorKunder, A-
dc.contributor.authorZwitter, T-
dc.contributor.authorKhalatyan, A-
dc.contributor.authorAnders, F-
dc.contributor.authorEnke, H-
dc.contributor.authorMinchev, I-
dc.contributor.authorMonari, G-
dc.contributor.authorWyse, RFG-
dc.contributor.authorBienaymé, O-
dc.contributor.authorBland-Hawthorn, J-
dc.contributor.authorGibson, BK-
dc.contributor.authorNavarro, JF-
dc.contributor.authorParker, Q-
dc.contributor.authorReid, W-
dc.contributor.authorSeabroke, GM-
dc.contributor.authorSiebert, A-
dc.date.accessioned2024-03-26T05:38:15Z-
dc.date.available2024-03-26T05:38:15Z-
dc.date.issued2020-12-16-
dc.identifier.citationAstronomy & Astrophysics, 2020, v. 644-
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/10722/341924-
dc.description.abstractContext. Data-driven methods play an increasingly important role in the field of astrophysics. In the context of large spectroscopic surveys of stars, data-driven methods are key in deducing physical parameters for millions of spectra in a short time. Convolutional neural networks (CNNs) enable us to connect observables (e.g. spectra, stellar magnitudes) to physical properties (atmospheric parameters, chemical abundances, or labels in general).Aims. We test whether it is possible to transfer the labels derived from a high-resolution stellar survey to intermediate-resolution spectra of another survey by using a CNN.Methods. We trained a CNN, adopting stellar atmospheric parameters and chemical abundances from APOGEE DR16 (resolution R=22 500) data as training set labels. As input, we used parts of the intermediate-resolution RAVE DR6 spectra (R similar to 7500) overlapping with the APOGEE DR16 data as well as broad-band ALL_WISE and 2MASS photometry, together with Gaia DR2 photometry and parallaxes.Results. We derived precise atmospheric parameters T-eff, log(g), and [M/H], along with the chemical abundances of [Fe/H], [alpha /M], [Mg/Fe], [Si/Fe], [Al/Fe], and [Ni/Fe] for 420 165 RAVE spectra. The precision typically amounts to 60 K in T-eff, 0.06 in log(g) and 0.02-0.04 dex for individual chemical abundances. Incorporating photometry and astrometry as additional constraints substantially improves the results in terms of the accuracy and precision of the derived labels, as long as we operate in those parts of the parameter space that are well-covered by the training sample. Scientific validation confirms the robustness of the CNN results. We provide a catalogue of CNN-trained atmospheric parameters and abundances along with their uncertainties for 420 165 stars in the RAVE survey.Conclusions. CNN-based methods provide a powerful way to combine spectroscopic, photometric, and astrometric data without the need to apply any priors in the form of stellar evolutionary models. The developed procedure can extend the scientific output of RAVE spectra beyond DR6 to ongoing and planned surveys such as Gaia RVS, 4MOST, and WEAVE. We call on the community to place a particular collective emphasis and on efforts to create unbiased training samples for such future spectroscopic surveys.-
dc.languageeng-
dc.publisherEDP Sciences-
dc.relation.ispartofAstronomy & Astrophysics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectGalaxy: Abundances-
dc.subjectGalaxy: stellar content-
dc.subjectMethods: data analysis-
dc.subjectStars: Abundances-
dc.subjectTechniques: spectroscopic-
dc.titleThe RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks-
dc.typeArticle-
dc.identifier.doi10.1051/0004-6361/202038271-
dc.identifier.scopuseid_2-s2.0-85098008804-
dc.identifier.volume644-
dc.identifier.eissn1432-0746-
dc.identifier.isiWOS:000600113300004-
dc.publisher.placeLES ULIS CEDEX A-
dc.identifier.issnl0004-6361-

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