J/A+A/487/1129ivo://CDS.VizieR/J/A+A/487/1129doi:10.26093/cds/vizier.34871129CDSVan Rensbergen W.De Greve J.P.De Loore C.Mennekens N.2010-12-09T09:56:13Z2009-03-20T10:42:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.freclipsing-binary-starsstellar-evolutionary-modelsThe observed distribution of orbital periods of Algols with a B-type primary at birth agrees fairly well with the prediction from conservative theory. Conservative evolution fails, however, to produce the rather large fraction of Algols observed with a high mass-ratio. In order to keep Algols for a longer time with a higher mass-ratio without disturbing the distribution of orbital periods too much, interacting binaries have to lose a significant fraction of their total mass without losing much angular momentum before or during Algolism. We propose a mechanism that meets both requirements. In the case of direct impact the gainer spins up: sometimes up to critical velocity. Equatorial material on the gainer is therefore less bound. A similar statement applies to material located at the edge of an accretion disc. The incoming material moreover creates a hot spot in the area of impact. The sum of the rotational and radiative energy of hot spot material depends on the mass- transfer-rate. The sum of both energies overcomes the binding energy at a well defined critical value of the mass-transfer-rate. As long as the transfer-rate is smaller than this critical value RLOF happens conservatively. But as soon as the critical rate is exceeded the gainer will acquire no more than the critical value and RLOF runs into a liberal era.2008A&A...487.1129Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/487/1129CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/487/1129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/487/1129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/487/1129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/487/1129https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/487/1129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/487/1129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/487/1129/summarySummary of initial parameters in the modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of file addition or extensiontime.epochnullableFileNamemeta.id;meta.filecharLineStarting line number (from 0) of modelmeta.id;meta.mainintstepsNumber of steps in file with these parametersmeta.numberintCase[wsc] (w)eak or (s)trong tidal interaction or (c)onservative casestat.paramcharMass1Initial mass of primarysolMassphys.massfloatPerOrbital period of the binarydtime.periodfloatMass2Initial mass of secondarysolMassphys.massfloat