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Article: Exploring the morphology of rave stellar spectra

TitleExploring the morphology of rave stellar spectra
Authors
Keywordsstars: peculiar
techniques: spectroscopic
methods: numerical
Issue Date2012
Citation
Astrophysical Journal, Supplement Series, 2012, v. 200, n. 2 How to Cite?
AbstractThe RAdial Velocity Experiment (RAVE) is a medium-resolution (R ∼ 7500) spectroscopic survey of the Milky Way that has already obtained over half a million stellar spectra. They present a randomly selected magnitude-limited sample, so it is important to use a reliable and automated classification scheme that identifies normal single stars and discovers different types of peculiar stars. To this end, we present a morphological classification of ∼350, 000 RAVE survey stellar spectra using locally linear embedding, a dimensionality reduction method that enables representing the complex spectral morphology in a low-dimensional projected space while still preserving the properties of the local neighborhoods of spectra. We find that the majority of all spectra in the database (∼90%-95%) belong to normal single stars, but there is also a significant population of several types of peculiars. Among them, the most populated groups are those of various types of spectroscopic binary and chromospherically active stars. Both of them include several thousands of spectra. Particularly the latter group offers significant further investigation opportunities since activity of stars is a known proxy of stellar ages. Applying the same classification procedure to the sample of normal single stars alone shows that the shape of the projected manifold in two-dimensional space correlates with stellar temperature, surface gravity, and metallicity. © 2012. The American Astronomical Society. All rights reserved..
Persistent Identifierhttp://hdl.handle.net/10722/208938
ISSN
2015 Impact Factor: 11.257
2015 SCImago Journal Rankings: 6.522

 

DC FieldValueLanguage
dc.contributor.authorMatijevič, Gal-
dc.contributor.authorZwitter, Tomaž-
dc.contributor.authorBienaymé, Olivier-
dc.contributor.authorBland-Hawthorn, Joss Bland-
dc.contributor.authorBoeche, Corrado-
dc.contributor.authorFreeman, K. C.-
dc.contributor.authorGibson, Brad K.-
dc.contributor.authorGilmore, Gerard F.-
dc.contributor.authorGrebel, Eva K.-
dc.contributor.authorHelmi, Amina-
dc.contributor.authorMunari, Ulisse-
dc.contributor.authorNavarro, Julio F.-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorReid, Warren A.-
dc.contributor.authorSeabroke, George M.-
dc.contributor.authorSiebert, Arnaud-
dc.contributor.authorSiviero, Alessandro-
dc.contributor.authorSteinmetz, Matthias-
dc.contributor.authorWatson, Fred G.-
dc.contributor.authorWilliams, Mary E K-
dc.contributor.authorWyse, Rosemary F G-
dc.date.accessioned2015-03-23T02:02:17Z-
dc.date.available2015-03-23T02:02:17Z-
dc.date.issued2012-
dc.identifier.citationAstrophysical Journal, Supplement Series, 2012, v. 200, n. 2-
dc.identifier.issn0067-0049-
dc.identifier.urihttp://hdl.handle.net/10722/208938-
dc.description.abstractThe RAdial Velocity Experiment (RAVE) is a medium-resolution (R ∼ 7500) spectroscopic survey of the Milky Way that has already obtained over half a million stellar spectra. They present a randomly selected magnitude-limited sample, so it is important to use a reliable and automated classification scheme that identifies normal single stars and discovers different types of peculiar stars. To this end, we present a morphological classification of ∼350, 000 RAVE survey stellar spectra using locally linear embedding, a dimensionality reduction method that enables representing the complex spectral morphology in a low-dimensional projected space while still preserving the properties of the local neighborhoods of spectra. We find that the majority of all spectra in the database (∼90%-95%) belong to normal single stars, but there is also a significant population of several types of peculiars. Among them, the most populated groups are those of various types of spectroscopic binary and chromospherically active stars. Both of them include several thousands of spectra. Particularly the latter group offers significant further investigation opportunities since activity of stars is a known proxy of stellar ages. Applying the same classification procedure to the sample of normal single stars alone shows that the shape of the projected manifold in two-dimensional space correlates with stellar temperature, surface gravity, and metallicity. © 2012. The American Astronomical Society. All rights reserved..-
dc.languageeng-
dc.relation.ispartofAstrophysical Journal, Supplement Series-
dc.subjectstars: peculiar-
dc.subjecttechniques: spectroscopic-
dc.subjectmethods: numerical-
dc.titleExploring the morphology of rave stellar spectra-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0067-0049/200/2/14-
dc.identifier.scopuseid_2-s2.0-84861831999-
dc.identifier.volume200-
dc.identifier.issue2-

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