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The oEA stars QY Aql, BW Del, TZ Dra, BO Her and RR Lep: photometric analysis, frequency search and evolutionary status

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Abstract

New and complete multi-band light curves of the oEA stars QY Aql, BW Del, TZ Dra, BO Her and RR Lep were obtained and analysed with the Wilson-Devinney code. The light curves residuals were further analysed with the Fourier method in order to derive the pulsation characteristics of the oscillating components. All the reliable observed times of minimum light were used to examine orbital period irregularities. The orbital period analyses revealed secular changes for QY Aql and BW Del, while the Light-Time Effect seems to be the best explanation for the cyclic period changes in TZ Dra and BO Her. RR Lep has a rather steady orbital period. Light curve solutions provided the means to calculate the absolute parameters of the components of the systems, which subsequently were used to make an estimate of their present evolutionary status.

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Acknowledgements

This work is part of the Ph.D. thesis of A.L. and has been financially supported by the Special Account for Research Grants No. 70/4/11112 of the National & Kapodistrian University of Athens, Hellas. In the present work, the minima database: (http://var.astro.cz/ocgate/), SIMBAD database, operated at CDS, Strasbourg, France, and Astrophysics Data System Bibliographic Services (NASA) have been used.

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  1. Department of Astrophysics, Astronomy and Mechanics, National and Kapodistrian University of Athens, 157 84, Zografos, Athens, Greece

    A. Liakos & P. Niarchos

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Liakos, A., Niarchos, P. The oEA stars QY Aql, BW Del, TZ Dra, BO Her and RR Lep: photometric analysis, frequency search and evolutionary status. Astrophys Space Sci 343, 123–133 (2013). https://doi.org/10.1007/s10509-012-1237-9

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