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EL CVn-type binaries - discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems
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dc.contributor.author | Maxted, P. F. L. | |
dc.contributor.author | Bloemen, S. | |
dc.contributor.author | Heber, U. | |
dc.contributor.author | Geier, S. | |
dc.contributor.author | Wheatley, P. J. | |
dc.contributor.author | Marsh, T. R. | |
dc.contributor.author | Breedt, E. | |
dc.contributor.author | Sebastian, D. | |
dc.contributor.author | Faillace, G. | |
dc.contributor.author | Owen, C. | |
dc.contributor.author | Pulley, D. | |
dc.contributor.author | Smith, D. | |
dc.contributor.author | Kolb, U. | |
dc.contributor.author | Haswell, C. A. | |
dc.contributor.author | Southworth, J. | |
dc.contributor.author | Anderson, D. R. | |
dc.contributor.author | Smalley, B. | |
dc.contributor.author | Cameron, A. Collier | |
dc.contributor.author | Hebb, L. | |
dc.contributor.author | Simpson, E. K. | |
dc.contributor.author | West, R. G. | |
dc.contributor.author | Bochinski, J. | |
dc.contributor.author | Busuttil, R. | |
dc.contributor.author | Hadigal, S. | |
dc.date.accessioned | 2014-09-11T16:01:01Z | |
dc.date.available | 2014-09-11T16:01:01Z | |
dc.date.issued | 2014-01-11 | |
dc.identifier | 135299924 | |
dc.identifier | 970fd4ca-5e9e-4456-a1e8-d06cb6c68f96 | |
dc.identifier | 000331617000049 | |
dc.identifier | 84890948038 | |
dc.identifier | 000331617000049 | |
dc.identifier.citation | Maxted , 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/stt2007 | en |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | ORCID: /0000-0002-8863-7828/work/58531314 | |
dc.identifier.uri | https://hdl.handle.net/10023/5405 | |
dc.description | This 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.abstract | The 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.extent | 17 | |
dc.format.extent | 2636450 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | en |
dc.subject | Binaries: close | en |
dc.subject | Binaries: eclipsing | en |
dc.subject | Binaries: spectroscopic | en |
dc.subject | Stars: individual: 1SWASP J024743.37-251549.2 | en |
dc.subject | Stars: individual: EL CVn | en |
dc.subject | Sky survey 2MASS | en |
dc.subject | Low-mass | en |
dc.subject | Stellar spectra | en |
dc.subject | Main-sequence | en |
dc.subject | Light-curves | en |
dc.subject | Evolution | en |
dc.subject | Library | en |
dc.subject | Kepler | en |
dc.subject | Core | en |
dc.subject | Calibration | en |
dc.subject | QB Astronomy | en |
dc.subject.lcc | QB | en |
dc.title | EL CVn-type binaries - discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems | en |
dc.type | Journal article | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.identifier.doi | 10.1093/mnras/stt2007 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | ST/J001651/1 | en |
dc.identifier.grantnumber | PP/F000065/1 | en |
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