Photometric study of two ? Lyr-type binaries: DD Aqr and RR Lep

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dc.authoridOzturk, Oguz/0000-0002-9135-9865
dc.contributor.authorErdem, A.
dc.contributor.authorOzturk, O.
dc.date.accessioned2025-01-27T20:51:51Z
dc.date.available2025-01-27T20:51:51Z
dc.date.issued2016
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThis paper presents detailed analysis of photometric observations of two eclipsing binary systems, DD Aqr and RR Lep. The V light curve of the neglected binary star DD Aqr from the All Sky Automated Survey was solved for the first time. The 1982-1987 UBV light curves of RR Lep from Vyas and Abhyankar (1989) were re-analysed. The final solutions give these two beta Lyr-type binary stars as having near contact configurations in which the secondary components almost fill their Roche limiting lobes. Using O-C residuals formed by the updated minima times, orbital period changes of the systems were analysed. The O-C diagram of DD Aqr displays a cyclic variation, while that of RR Lep shows a quasi-sinusoidal variation superimposed on a downward parabolic form. The parabolic variation, which suggests a secular orbital period decrease in RR Lep, was interpreted in terms of the combined effect of mass transfer and loss. The cyclic O-C variations were interpreted in terms of the light travel time effect due to unseen components in these two systems. The absolute parameters of the components of the systems were estimated, and their present evolutionary status is also discussed. (C) 2016 Elsevier B.V. All rights reserved.
dc.description.sponsorshipTUBITAK (Scientific and Technological Research Council of Turkey)
dc.description.sponsorshipThis work was partly supported by TUBITAK (Scientific and Technological Research Council of Turkey) for a Doctoral Fellowship Award. We would like to thank the anonymous referee who provided valuable comments for improving the manuscript. We also thank Mr. G.H. Lee for checking the English.
dc.identifier.doi10.1016/j.newast.2016.04.003
dc.identifier.endpage41
dc.identifier.issn1384-1076
dc.identifier.issn1384-1092
dc.identifier.scopus2-s2.0-84964455457
dc.identifier.scopusqualityQ2
dc.identifier.startpage33
dc.identifier.urihttps://doi.org/10.1016/j.newast.2016.04.003
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25550
dc.identifier.volume48
dc.identifier.wosWOS:000377819100007
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofNew Astronomy
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectStars
dc.subjectBinaries
dc.subjectEclipsing - stars
dc.subjectFundamental parameters - stars
dc.subjectIndividual (DD Aqr RR Lep)
dc.titlePhotometric study of two ? Lyr-type binaries: DD Aqr and RR Lep
dc.typeArticle

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