Twin stars as tracers of binary evolution in the Kepler era
| Autor: | Sara Bulut, O. Özdarcan, Ömür Çakırlı, Barış Hoyman, Ahmet Dervişoğlu |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
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Binary number 01 natural sciences Kepler Modules Stellar Tracks Cepheid 0103 physical sciences Binary star Astrophysics::Solar and Stellar Astrophysics Mesa Isochrones stars: evolution 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics stars: late-type Eclipsing Binaries Astronomy binaries: eclipsing Pulsations Astronomy and Astrophysics Spectra Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics stars: fundamental parameters Catalog Space Science binaries: spectroscopic |
| Popis: | We present results of the combined photometric and spectroscopic analysis of four systems that are eclipsing binaries with a twin component (mass ratio q similar or equal to 1). These are exceptional tools to provide information for probing the internal structure of stars. None of the systems were previously recognized as twin binaries. We used a number of high-resolution optical spectra to calculate the radial velocities and later combined them with photometry to derive orbital parameters. Temperatures and metallicities of systems were estimated from high-resolution spectra. For each binary, we obtained a full set of orbital and physical parameters, reaching precision below 3 per cent in masses and radii for whole pairs. By comparing our results with PARSEC and MIST isochrones, we assess the distance, age, and evolutionary status of the researched objects. The primary and/or secondary stars of EPIC216075815 and EPIC202843107 are one of the cases where asteroseismic parameters of delta Sct and gamma Dor pulsators were confirmed by an independent method and rare examples of the twin-eclipsing binaries therefore the following analyses and results concern the pulsating nature of the components. Ege University Research Foundation [FDK-2019-20215]; NASA Science Mission Directorate; ESO [099.D-0380(A), 0100.D-0273(A), 0101.D-0697(A)] We are grateful to the anonymous referee for her/his valuable suggestions. This research made use of data collected at ESO under programmes 099.D-0380(A), 0100.D-0273(A) (byGieren, W.) and 0101.D-0697(A) (by Pietrzynski, G.). We thank Ege University Research Foundation (Project No. FDK-2019-20215) for supporting this study. This article is a part of the PhD thesis of BH. The following internet-based resources were used in research for this paper: the NASA Astrophysics Data System; the SIMBAD database operated at CDS, Strasbourg, France. Thiswork is based on data from the Kepler mission. Kepler was competitively selected as the tenth Discovery mission. Funding for this mission is provided by NASA Science Mission Directorate. The photometric data were obtained from the Mikulski Archive for Space Telescopes (MAST). This work has also made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). |
| Databáze: | OpenAIRE |
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