dc.contributor.author Molnar, Thomas A. dc.contributor.author Sanders, Jason L. dc.contributor.author Smith, Leigh C. dc.contributor.author Belokurov, Vasily dc.contributor.author Lucas, Philip dc.contributor.author Minniti, Dante dc.date.accessioned 2022-04-01T16:30:01Z dc.date.available 2022-04-01T16:30:01Z dc.date.issued 2021-10-30 dc.identifier.citation Molnar , T A , Sanders , J L , Smith , L C , Belokurov , V , Lucas , P & Minniti , D 2021 , ' Variable star classification across the Galactic bulge and disc with the VISTA Variables in the Vía Láctea survey ' , Monthly Notices of the Royal Astronomical Society , vol. 509 , no. 2 , pp. 2566-2592 . https://doi.org/10.1093/mnras/stab3116 dc.identifier.issn 1365-2966 dc.identifier.other PURE: 27080781 dc.identifier.other PURE UUID: 8e47cc4a-f9ee-47e9-b2b8-f9ed03c1453d dc.identifier.other ArXiv: http://arxiv.org/abs/2110.15371v1 dc.identifier.other ORCID: /0000-0002-8872-4462/work/110878962 dc.identifier.uri http://hdl.handle.net/2299/25458 dc.description © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stab3116 dc.description.abstract We present VIVACE, the VIrac VAriable Classification Ensemble, a catalogue of variable stars extracted from an automated classification pipeline for the Vista Variables in the V\'ia L\'actea (VVV) infrared survey of the Galactic bar/bulge and southern disc. Our procedure utilises a two-stage hierarchical classifier to first isolate likely variable sources using simple variability summary statistics and training sets of non-variable sources from the Gaia early third data release, and then classify candidate variables using more detailed light curve statistics and training labels primarily from OGLE and VSX. The methodology is applied to point-spread-function photometry for $\sim490$ million light curves from the VIRAC v2 astrometric and photometric catalogue resulting in a catalogue of $\sim1.4$ million likely variable stars, of which $\sim39,000$ are high-confidence (classification probability $>0.9$) RR Lyrae ab stars, $\sim8000$ RR Lyrae c/d stars, $\sim187,000$ detached/semi-detached eclipsing binaries, $\sim18,000$ contact eclipsing binaries, $\sim1400$ classical Cepheid variables and $\sim2200$ Type II Cepheid variables. Comparison with OGLE-4 suggests a completeness of around $90\,\%$ for RRab and $\lesssim60\%$ for RRc/d, and a misclassification rate for known RR Lyrae stars of around $1\%$ for the high confidence sample. We close with two science demonstrations of our new VIVACE catalogue: first, a brief investigation of the spatial and kinematic properties of the RR Lyrae stars within the disc/bulge, demonstrating the spatial elongation of bar-bulge RR Lyrae stars is in the same sense as the more metal-rich red giant population whilst having a slower rotation rate of $\sim40\,\mathrm{km\,s}^{-1}\mathrm{kpc}^{-1}$; and secondly, an investigation of the Gaia EDR3 parallax zeropoint using contact eclipsing binaries across the Galactic disc plane and bulge. en dc.format.extent 27 dc.language.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.rights Open dc.subject astro-ph.SR dc.subject astro-ph.GA dc.title Variable star classification across the Galactic bulge and disc with the VISTA Variables in the Vía Láctea survey en dc.contributor.institution Centre for Astrophysics Research dc.contributor.institution Centre for Climate Change Research dc.contributor.institution School of Physics, Engineering & Computer Science dc.contributor.institution Department of Physics, Astronomy and Mathematics dc.description.status Peer reviewed dc.relation.school School of Physics, Engineering & Computer Science dc.description.versiontype Final Accepted Version dcterms.dateAccepted 2021-10-30 rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1093/mnras/stab3116 rioxxterms.licenseref.uri Unspecified rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true herts.rights.accesstype Open
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