First detailed study of two eccentric eclipsing binaries: TYC 5378-1590-1 and TYC 8378-252-1

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dc.contributor.authorZasche, P.
dc.contributor.authorSurgit, D.
dc.contributor.authorErdem, A.
dc.contributor.authorEngelbrecht, C. A.
dc.contributor.authorMarang, F.
dc.date.accessioned2025-01-27T20:43:46Z
dc.date.available2025-01-27T20:43:46Z
dc.date.issued2023
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractAims. The analysis of combined photometry and spectroscopy of eccentric eclipsing binary systems facilitates the derivation of very precise values for a large ensemble of physical parameters of the component stars and their orbits, thereby providing stringent tests of theories of stellar structure and evolution. In this paper two eccentric eclipsing binary systems, TYC 5378-1590-1 and TYC 8378252-1, are studied in detail for the first time. Methods. Radial velocities were obtained using cross-correlation methods applied to mid-resolution spectra covering almost the entire orbital phase domains of these two systems. TESS photometry was used for the analysis of TYC 5378-1590-1, whereas ASAS-SN photometry was used for the analysis of TYC 8378-252-1. Results. We obtained the first precise derivation of the physical parameters of these systems. Both systems display moderately eccentric orbits (e similar to 0:3 and 0:2) with periods of 3.73235 and 2.87769 days, respectively. The apsidal motion is very slow, with a duration of several centuries for both systems. We present two models for the apsidal motion of TYC 5378-1590-1. The internal structure constant derived from observations for TYC 8378-252-1 is approximately 11% lower than theoretical predictions. We discuss possible reasons for this discrepancy. Our analysis indicates that the components of both systems are on the main sequence. The components of TYC 5378-1590-1 are relatively young stars (age similar to 600 Myr) close to the ZAMS, whereas the components of TYC 8378-252-1 are relatively old stars (age similar to 4 Gyr) close to the TAMS. Our finding that the circularization timescale for TYC 5378-1590-1 is similar to 200 times longer than its evolutionary age is compatible with circularization theory; however, our finding that the evolutionary age of TYC 8378-252-1 is approximately ten times longer than the circulation age, while its orbital eccentricity is quite high (e similar to 0:2), challenges the present theories of circularization.
dc.description.sponsorshipTUBITAK (Scientific and Technological Research Council of Turkiye) [121F203]; National Research Foundation of South Africa; University of Johannesburg; DFG (German Research Foundation); Leibniz Institute for Astrophysics Potsdam; Hamburger Sternwarte (University of Hamburg); Tartu Observatory; NASA Explorer Program; Dr. Remeis Sternwarte Bamberg (University Nuernberg/Erlangen)
dc.description.sponsorshipThis research was supported by TUBITAK (Scientific and Technological Research Council of Turkiye) under Grant No. 121F203. We would like to thank the Time Allocation Committee of the SAAO for ample observing time. CE and FM thank the National Research Foundation of South Africa and the University of Johannesburg for funding. Funding for APPLAUSE has been provided by DFG (German Research Foundation, Grant), Leibniz Institute for Astrophysics Potsdam (AIP), Dr. Remeis Sternwarte Bamberg (University Nuernberg/Erlangen), the Hamburger Sternwarte (University of Hamburg) and Tartu Observatory. Plate material also has been made available from Thueringer Landessternwarte Tautenburg. It is a pleasure to express our appreciation of the high quality and ready availability, via the Mikulski Archive for Space Telescopes (MAST), of data collected by the TESS mission. Funding for the TESS mission is provided by the NASA Explorer Program. The authors thank the ASAS, ASAS-SN, CRTS, NSVS and TESS teams for making all of the observations easily public available. This research has made partial use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has partly made use of the SIMBAD and VIZIER databases, operated at CDS, Strasbourg, France, and of NASA's Astrophysics Data System Bibliographic Services.
dc.identifier.doi10.1051/0004-6361/202245386
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.scopus2-s2.0-85147660371
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202245386
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24366
dc.identifier.volume670
dc.identifier.wosWOS:001004172200018
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherEdp Sciences S A
dc.relation.ispartofAstronomy & Astrophysics
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectbinaries: eclipsing
dc.subjectbinaries: spectroscopic
dc.subjectstars: fundamental parameters
dc.titleFirst detailed study of two eccentric eclipsing binaries: TYC 5378-1590-1 and TYC 8378-252-1
dc.typeArticle

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