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Photometric and polarimetric studies of three W UMa-type binaries: FZ Ori, V407 Peg and LP UMa

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dc.contributor.author Prasad, Vinod
dc.contributor.author Pandey, J. C.
dc.contributor.author Patel, M. K.
dc.contributor.author Srivastava, D. C.
dc.date.accessioned 2015-06-01T08:45:47Z
dc.date.available 2015-06-01T08:45:47Z
dc.date.issued 2014-10
dc.identifier.uri http://hdl.handle.net/123456789/1071
dc.description.abstract We present analyses of new optical photometric observations of three W UMa-type contact binaries FZ Ori, V407 Peg and LP UMa. Results from the first polarimet- ric observations of the FZ Ori and V407 Peg are also pre- sented. The periods of FZ Ori, V407 Peg and LP UMa are derived to be 0.399986, 0.636884 and 0.309898 d, respec- tively. The O−C analyses indicate that the orbital periods of FZ Ori and LP UMa have increased with the rate of 2.28 × 10⁻⁸ and 1.25 × 10⁻⁶d yr⁻¹ , respectively and which is explained by transfer of mass between the components. In addition to the secularly increasing rate of orbital period, it was found that the period of FZ Ori has varied in sinusoidal way with oscillation period of ∼30.1 yr. The period of os- cillations are most likely to be explained by the light-time effect due to the presence of a tertiary companion. Small asymmetries have been seen around the primary and sec- ondary maxima of light curves of all three systems, which is probably due to the presence of cool/hot spots on the com- ponents. The light curves of all three systems are analysed by using Wilson-Devinney code (WD) and the fundamental parameters of these systems have been derived. The present analyses show that FZ Ori is a W-subtype, and V407 Peg and LP UMa are A-subtype of the W UMa-type contact binary systems. The polarimetric observations in B, V , R and I bands, yield average values of polarization to be 0.26 ± 0.03, 0.22 ± 0.02, 0.22 ± 0.03 and 0.22 ± 0.05 per cent for FZ Ori and 0.21 ± 0.02, 0.29 ± 0.03, 0.31 ± 0.01 and 0.31 ± 0.04 per cent for V407 Peg, respectively. en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries apss353-575
dc.subject Binaries · Close-binaries · Eclipsing-stars · Evolution-stars · Individual (FZ Ori, V407 Peg and LP UMa) en_US
dc.title Photometric and polarimetric studies of three W UMa-type binaries: FZ Ori, V407 Peg and LP UMa en_US
dc.type Article en_US


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