THE FIRST MULTICOLOUR PHOTOMETRY OF THE V840 LYR CONTACT BINARY STAR

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dc.contributor.authorTanrıver, Mehmet
dc.contributor.authorMichel, Ral
dc.contributor.authorBulut, Ahmet
dc.contributor.authorAceves, Hector
dc.contributor.authorKeskin, Ahmet
dc.date.accessioned2025-01-27T20:41:51Z
dc.date.available2025-01-27T20:41:51Z
dc.date.issued2024
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractLight curves for the total-eclipsing binary system V840 Lyr in the V, R degrees, and I degrees bands are presented; these display the O'Connell effect. Analysis was performed with the Phoebe031a software revealing that V840 Lyr is a W-type contact binary with a degree of contact factor of f = 15.1 +/- 5.6%, a mass ratio of q = 0.4509 +/- 0.0705, an inclination of i = 86.7 degrees, and a temperature difference of triangle T = 45 K. An asymmetry in the light curves was modeled assuming a cool spot located on the secondary star. The period changes of the system are examined by combining our recently found times of light minima together with those in the literature. Absolute parameters were obtained as M1 = 0.74M((R)), M2 = 0.34M((R)), R1 = 0.74R((R)), and R2 = 0.51R((R)) from our photometric solutions, using some empirical relations. The long-term period increase and the contact configuration indicate that V840 Lyr will evolve into a fill-out overcontact binary.
dc.description.sponsorshipNational Aeronautics and Space Administration; National Science Foundation
dc.description.sponsorshipWe thank the San Pedro Martir National Astronomical Observatory (SPM) for its support in allowing us the use of its T84 telescope, and Edilberto Sanchez-Moreno (IAUNAM) for help with some of our figures. We gratefully acknowledge the SIMBAD, ADS, CRTS, TESS, BRNO O-C Gateway, Krakow O-C Atlas, NASA/IPAC, and Gaia EDR3 databases for also providing data. We acknowledge with thanks the variable star observations from the AAVSO International Database contributed by observers worldwide and used in this research. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. We also thank the anonymous referee for her/his valuable comments to improve this article.
dc.identifier.doi10.22201/ia.01851101p.2024.60.01.07
dc.identifier.endpage111
dc.identifier.issn0185-1101
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85196049407
dc.identifier.scopusqualityQ3
dc.identifier.startpage99
dc.identifier.urihttps://doi.org/10.22201/ia.01851101p.2024.60.01.07
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24255
dc.identifier.volume60
dc.identifier.wosWOS:001209397200013
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherUniv Nacional Autonoma Mexico, Inst De Astronomia
dc.relation.ispartofRevista Mexicana De Astronomia Y Astrofisica
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectstars: binaries: eclipsing
dc.subjectstars: binaries: general
dc.subjectstars: individual
dc.subjectV840 Lyr
dc.titleTHE FIRST MULTICOLOUR PHOTOMETRY OF THE V840 LYR CONTACT BINARY STAR
dc.typeArticle

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