The first study of the light-travel time effect in bright eclipsing binaries in the Small Magellanic Cloud

Abstract

The first 100 brightest eclipsing systems from the Small Magellanic Cloud were studied for their period changes. The photometric data from the surveys OGLE-II, OGLE-III, OGLE-IV and MACHO were combined with our new CCD observations obtained using the Danish 1.54-m telescope (La Silla, Chile). Besides the period changes the light curves were also analysed using the program PHOEBE, which provided the physical parameters of both eclipsing components. For 14 of these systems the additional bodies were found, having the orbital periods from 2 to 20 yr and the eccentricities were found to be up to 0.9. Amongst the sample of studied 100 brightest systems, we discussed the number of systems with particular period changes. About 10 per cent of these stars show eccentric orbit, about the same numbers have third bodies and about the same show the asymmetric light curves.

7 pages, 3 figures, 4 tables, published in: 2017MNRAS.472.2241Z. arXiv admin note: text overlap with arXiv:1605.07325

References in corpus (6)

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Cited by in corpus (7)

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• Constraining the overcontact phase in massive binary evolution -- II. Period stability of known O+O overcontact systems
• Then and now: A new look at the eclipse timing variations of hierarchical triple star candidates in the primordial $Kepler$-field, revisited by TESS
• Variable stars in the residual light curves of OGLE-IV eclipsing binaries towards the Galactic Bulge