Apsidal motion and absolute parameters of GV Nor and V881 Sco based on mid-resolution spectroscopy and TESS photometry

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dc.authoridERDEM, Ahmet/0000-0001-5289-8850
dc.authoridMasek, Martin/0000-0002-0967-0006
dc.contributor.authorSurgit, Derya
dc.contributor.authorZasche, Petr
dc.contributor.authorHadrava, Petr
dc.contributor.authorErdem, Ahmet
dc.contributor.authorEngelbrecht, Chris A.
dc.contributor.authorMarang, Fred
dc.contributor.authorMasek, Martin
dc.date.accessioned2025-01-27T20:27:04Z
dc.date.available2025-01-27T20:27:04Z
dc.date.issued2023
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe veracity of stellar evolution models and theoretical internal structure constants may be subjected to stringent tests by using physical parameters obtained from spectroscopic and photometric observations of eclipsing binary systems that exhibit apsidal motion. Two eclipsing binary stars from the southern hemisphere with no prior published spectroscopic analyses were selected for this study: GV Nor and V881 Sco. Spectroscopic observations of these two eccentric binary systems were made at the South African Astronomical Observatory (SAAO) in 2018 and 2019, and their mid-resolution spectra were obtained. The radial velocities were measured using the cross-correlation method as well as by disentangling the spectra. The rotational broadening of the disentangled spectra of the components was also determined. The absolute parameters of these two systems were obtained by analyzing the SAAO-based spectroscopic data in conjunction with photometric data from Transiting Exoplanet Survey Satellite. Apsidal motion parameters for these two eccentric binary systems were calculated by analysing eclipse timing variations. Granada and Padova evolution models indicated ages of 340 +/- 35 Myr for GV Nor and 760 +/- 15 Myr for V881 Sco, in agreement with the observational results. The theoretical internal structure constants estimated from the Granada models were compatible with the observational values within the error limits. However, for both systems, it was found that their circularization and synchronization timescales were shorter than their respective evolutionary ages. Therefore, the fact that the components rotate faster than their synchronized values and still have rather large eccentric orbits (e similar to 0.11) challenges present theories of circularization and spin-orbit synchronization.
dc.description.sponsorshipTUBITAK(Scientific and Technological Research Council of Turkiye) [121F203]; South African National Research Foundation; University of Johannesburg; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium; Ministry of Education of the Czech Republic [MSMT-CR LTT18004]; MSMT/EU funds [CZ.02.1.01/0.0/0.0/16_013/0001402, CZ.02.1.01/0.0/0.0/18_046/0016010, CZ.02.1.01/0.0/0.0/18_046/0016007]; NASA Explorer Program; NSF [AST-1412587]; [RVO 67985815]
dc.description.sponsorshipThis research was supported by TUBITAK(Scientific and Technological Research Council of Turkiye)under Grant No. 121F203. PH acknowledges support by project RVO 67985815. CAE thanks the South African National Research Foundation and the University of Johannesburg for financial support. All the authors thank the SAAO for observing time. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. The authors thank the anonymous referee for guidance, which led to an improved paper. AP is also acknowledged for sending us his photometric observations. The authors would also like to thank the Pierre Auger Collaboration for the use of its facilities. The operation of the robotic telescope FRAM is supported by the grant of the Ministry of Education of the Czech Republic LM2018102. The data calibration and analysis related to the FRAM telescope is supported by the Ministry of Education of the Czech Republic MSMT-CR LTT18004, MSMT/EU funds CZ.02.1.01/0.0/0.0/16_013/0001402, CZ.02.1.01/0.0/0.0/18_046/0016010, and CZ.02.1.01/0.0/0.0/18_046/0016007. It is a pleasure to express the 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. This research partly made use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund and NSF AST-1412587. This research was also partly based on data from the OMC Archive at CAB (INTA-CSIC), pre-processed by ISDC. The authors thank the ASAS, ASAS-SN, APASS, Bamberg, DASCH, FRAM, KELT, KWS, OMC, and TESS teams for making all of the observations readily accessible on public platforms. This work 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 partly made use of the SIMBAD database, operated at CDS, Strasbourg, France, and of NASA's Astrophysics Data System Bibliographic Services.
dc.identifier.doi10.1093/mnras/stac3738
dc.identifier.endpage4715
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85171896369
dc.identifier.scopusqualityQ1
dc.identifier.startpage4699
dc.identifier.urihttps://doi.org/10.1093/mnras/stac3738
dc.identifier.urihttps://hdl.handle.net/20.500.12428/22567
dc.identifier.volume519
dc.identifier.wosWOS:001035850100023
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
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.subjectstars: binaries: eclipsing
dc.subjectstars: early type
dc.subjectstars: fundamental parameters
dc.subjectstars: individual: GV Nor
dc.subjectstars: individual: V881 Sco
dc.titleApsidal motion and absolute parameters of GV Nor and V881 Sco based on mid-resolution spectroscopy and TESS photometry
dc.typeArticle

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