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Astrophysics and Space Science

, 364:214 | Cite as

Absolute parameters and apsidal motion of the eccentric binary V889 Aql

  • Evrim KıranEmail author
  • Volkan Bakış
  • Hicran Bakış
  • Ömer L. Değirmenci
Original Article
  • 12 Downloads

Abstract

We present accurate physical parameters of the eccentric binary system V889 Aql using its new spectroscopic data. According to our solutions, the system consists of two nearly identical components with primary slightly evolved. The parameters of the components are \(T_{\mathrm{eff1}}= 10000\pm 250\) K, \(T_{\mathrm{eff2}}= 10500\pm250\) K, \(M_{1} = 2.12\pm 0.14\) \({M}_{\odot}\), \(M_{2} = 2.11\pm0.14\)\({M}_{\odot}\), \(R_{1} = 1.93\pm 0.02\)\({R}_{\odot}\), \(R_{2} = 1.74\pm0.02\)\({R}_{\odot}\), \(\log L_{1} = 1.52\pm0.05\)\({L}_{\odot}\), \(\log L_{2} = 1.52\pm0.04\)\({L}_{\odot}\). We verify the apsidal motion in the system and investigate the presence of a third body discussed in the literature. The internal structure constants of the components are derived for the first time. According to the O–C analysis, high rate of relativistic contribution to the apsidal motion given in the literature is confirmed and a value of the relativistic contribution of 68 per cent is obtained.

Keywords

Stars: binaries: detached Stars: binaries: eclipsing Stars: individual (V889 Aql) Techniques: photometric Techniques: spectroscopic 

Notes

Acknowledgements

The research of EK was supported with the fellowship of BİDEP-2218 Post-Doctoral Research Fellowship Programme of The Scientific and Technological Research Council of Turkey (TÜBİTAK). It is a pleasure to record here our thanks to referee for her/his valuable comments and suggestions. We benefited from the use of the SIMBAD database.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Space Sciences and TechnologiesFaculty of Science, Akdeniz UniversityAntalyaTurkey
  2. 2.Department of Astronomy & Space SciencesFaculty of Science, Ege UniversityİzmirTurkey

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