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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 709799.0, MPI für Astronomie / Publikationen_mpia
The EPOCH Project. I. Periodic variable stars in the EROS-2 LMC database
Authors:Kim, D.-W.; Protopapas, P.; Bailer-Jones, C. A. L.; Byun, Y.-I.; Chang, S.-W.; Marquette, J.-B.; Shin, M.-S.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Astronomy and Astrophysics
Volume:566
Start Page:id. A43 (19 pp)
Audience:Not Specified
Abstract / Description:The EPOCH (EROS-2 periodic variable star classification using machine learning) project aims to detect periodic variable stars in the EROS-2 light curve database. In this paper, we present the first result of the classification of periodic variable stars in the EROS-2 LMC database. To classify these variables, we first built a training set by compiling known variables in the Large Magellanic Cloud area from the OGLE and MACHO surveys. We crossmatched these variables with the EROS-2 sources and extracted 22 variability features from 28 392 light curves of the corresponding EROS-2 sources. We then used the random forest method to classify the EROS-2 sources in the training set. We designed the model to separate not only delta Scuti stars, RR Lyraes, Cepheids, eclipsing binaries, and long-period variables, the superclasses, but also their subclasses, such as RRab, RRc, RRd, and RRe for RR Lyraes, and similarly for the other variable types. The model trained using only the superclasses shows 99% recall and precision, while the model trained on all subclasses shows 87% recall and precision. We applied the trained model to the entire EROS-2 LMC database, which contains about 29 million sources, and found 117 234 periodic variable candidates. Out of these 117 234 periodic variables, 55 285 have not been discovered by either OGLE or MACHO variability studies. This set comprises 1906 delta Scuti stars, 6607 RR Lyraes, 638 Cepheids, 178 Type II Cepheids, 34 562 eclipsing binaries, and 11 394 long-period variables. catalog of these EROS-2 LMC periodic variable stars is available at <A href="http://stardb.yonsei.ac.kr">http://stardb.yonsei.ac.kr</A> and at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/566/A43">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/566/A43</A>
Free Keywords:stars: variables: general; Magellanic Clouds; methods: data analysis
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201323252
URL:http://cdsads.u-strasbg.fr/abs/2014A%26A...566A..4...
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