Show simple item record

Files in this item

Thumbnail

Item metadata

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.date.accessioned2014-09-11T16:01:01Z
dc.date.available2014-09-11T16:01:01Z
dc.date.issued2014-01-11
dc.identifier135299924
dc.identifier970fd4ca-5e9e-4456-a1e8-d06cb6c68f96
dc.identifier000331617000049
dc.identifier84890948038
dc.identifier000331617000049
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 . https://doi.org/10.1093/mnras/stt2007en
dc.identifier.issn0035-8711
dc.identifier.otherORCID: /0000-0002-8863-7828/work/58531314
dc.identifier.urihttps://hdl.handle.net/10023/5405
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.format.extent17
dc.format.extent2636450
dc.language.isoeng
dc.relation.ispartofMonthly Notices 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.subjectLow-massen
dc.subjectStellar spectraen
dc.subjectMain-sequenceen
dc.subjectLight-curvesen
dc.subjectEvolutionen
dc.subjectLibraryen
dc.subjectKepleren
dc.subjectCoreen
dc.subjectCalibrationen
dc.subjectQB Astronomyen
dc.subject.lccQBen
dc.titleEL CVn-type binaries - discovery of 17 helium white dwarf precursors in bright eclipsing binary star systemsen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doi10.1093/mnras/stt2007
dc.description.statusPeer revieweden
dc.identifier.grantnumberST/J001651/1en
dc.identifier.grantnumberPP/F000065/1en


This item appears in the following Collection(s)

Show simple item record