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dc.contributor.authorMaxted, P. F. L.
dc.contributor.authorBloemen, S.
dc.contributor.authorHeber, U.
dc.contributor.authorGeier, S.
dc.contributor.authorWheatley, P. J.
dc.contributor.authorMarsh, T. R.
dc.contributor.authorBreedt, E.
dc.contributor.authorSebastian, D.
dc.contributor.authorFaillace, G.
dc.contributor.authorOwen, C.
dc.contributor.authorPulley, D.
dc.contributor.authorSmith, D.
dc.contributor.authorKolb, U.
dc.contributor.authorHaswell, C. A.
dc.contributor.authorSouthworth, J.
dc.contributor.authorAnderson, D. R.
dc.contributor.authorSmalley, B.
dc.contributor.authorCameron, A. Collier
dc.contributor.authorHebb, L.
dc.contributor.authorSimpson, E. K.
dc.contributor.authorWest, R. G.
dc.contributor.authorBochinski, J.
dc.contributor.authorBusuttil, R.
dc.contributor.authorHadigal, S.
dc.identifier.citationMaxted , P F L , Bloemen , S , Heber , U , Geier , S , Wheatley , P J , Marsh , T R , Breedt , E , Sebastian , D , Faillace , G , Owen , C , Pulley , D , Smith , D , Kolb , U , Haswell , C A , Southworth , J , Anderson , D R , Smalley , B , Cameron , A C , Hebb , L , Simpson , E K , West , R G , Bochinski , J , Busuttil , R & Hadigal , S 2014 , ' EL CVn-type binaries - discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems ' , Monthly Notices of the Royal Astronomical Society , vol. 437 , no. 2 , pp. 1681-1697 .
dc.identifier.otherPURE: 135299924
dc.identifier.otherPURE UUID: 970fd4ca-5e9e-4456-a1e8-d06cb6c68f96
dc.identifier.otherWOS: 000331617000049
dc.identifier.otherScopus: 84890948038
dc.identifier.otherORCID: /0000-0002-8863-7828/work/58531314
dc.identifier.otherWOS: 000331617000049
dc.descriptionThis work was supported by funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007–2013)/ERC grant agreement no 227224 (PROSPERITY), as well as from the Science and Technology Facilities Council (grant numbers ST/I001719/1, ST/J001384/1)en
dc.description.abstractThe star 1SWASP J024743.37-251549.2 was recently discovered to be a binary star in which an A-type dwarf star eclipses the remnant of a disrupted red giant star (WASP 0247-25 B). The remnant is in a rarely observed state evolving to higher effective temperatures at nearly constant luminosity prior to becoming a very low mass white dwarf composed almost entirely of helium, i.e. it is a pre-helium white dwarf (pre-He-WD). We have used the photometric database from the Wide Angle Search for Planets (WASP) to find 17 eclipsing binary stars with orbital periods P = 0.7-2.2 d with similar light curves to 1SWASP J024743.37-251549.2. The only star in this group previously identified as a variable star is the brightest one, EL CVn, which we adopt as the prototype for this class of eclipsing binary star. The characteristic light curves of EL CVn-type stars show a total eclipse by an A-type dwarf star of a smaller, hotter star and a secondary eclipse of comparable depth to the primary eclipse. We have used new spectroscopic observations for six of these systems to confirm that the companions to the A-type stars in these binaries have very low masses (≈0.2MΘ). This includes the companion to EL CVn which was not previously known to be a pre-He-WD. EL CVn-type binary star systems will enable us to study the formation of very low mass white dwarfs in great detail, particularly in those cases where the pre-He-WD star shows non-radial pulsations similar to those recently discovered in WASP0247-25 B.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rights© 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Societyen
dc.subjectBinaries: closeen
dc.subjectBinaries: eclipsingen
dc.subjectBinaries: spectroscopicen
dc.subjectStars: individual: 1SWASP J024743.37-251549.2en
dc.subjectStars: individual: EL CVnen
dc.subjectSky survey 2MASSen
dc.subjectStellar spectraen
dc.subjectQB Astronomyen
dc.titleEL CVn-type binaries - discovery of 17 helium white dwarf precursors in bright eclipsing binary star systemsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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