Dynamical evolution of active detached binaries on the log Jo-log M diagram and contact binary formation

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dc.authoridBilir, Selcuk/0000-0003-3510-1509
dc.contributor.authorEker, Z.
dc.contributor.authorDemircan, O.
dc.contributor.authorBilir, S.
dc.contributor.authorKaratas, Y.
dc.date.accessioned2025-01-27T20:12:29Z
dc.date.available2025-01-27T20:12:29Z
dc.date.issued2006
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractOrbital angular momentum (OAM, J(o)), systemic mass (M) and orbital period (P) distributions of chromospherically active binaries (CAB) and W Ursae Majoris (W UMa) systems were investigated. The diagrams of logJ(o)-IogP, logM-logP and logJ(o)-IogM were fortned from 119 CAB and 102 W UMa stars. The log J(o)-Iog M diagram is found to be most meaningful in demonstrating dynamical evolution of binary star orbits. A slightly curved borderline (contact border) separating the detached and the contact systems was discovered on the log J(o)-Iog M diagram. Since the orbital size (a) and period (P) of binaries are determined by their current J(o), M and mass ratio, q, the rates of OAM loss (d log J(o)/dt) and mass loss (d log M/dt) are primary parameters to determine the direction and the speed of the dynamical evolution. A detached system becomes a contact system if its own dynamical evolution enables it to pass the contact border on the log J(o)-log M diagram. The evolution of q for a mass-losing detached system is unknown unless the mass-loss rate for each component is known. Assuming q is constant in the first approximation and using the mean decreasing rates of J(o) and M from the kinematical ages of CAB stars, it has been predicted that 11, 23 and 39 per cent of current CAB stars would transform to W UMa systems if their nuclear evolution permits them to live 2, 4 and 6 Gyr, respectively.
dc.identifier.doi10.1111/j.1365-2966.2006.11073.x
dc.identifier.endpage1494
dc.identifier.issn0035-8711
dc.identifier.issue4
dc.identifier.scopus2-s2.0-33845316106
dc.identifier.scopusqualityQ1
dc.identifier.startpage1483
dc.identifier.urihttps://doi.org/10.1111/j.1365-2966.2006.11073.x
dc.identifier.urihttps://hdl.handle.net/20.500.12428/20953
dc.identifier.volume373
dc.identifier.wosWOS:000243153000017
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherBlackwell Publishing
dc.relation.ispartofMonthly Notices of The Royal Astronomical Society
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectbinaries : spectroscopic
dc.subjectstars : evolution
dc.subjectstars : mass-loss
dc.titleDynamical evolution of active detached binaries on the log Jo-log M diagram and contact binary formation
dc.typeArticle

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