Bvri Observations and Analyses of the Semidetached Binary Ff Vulpecula

Samec, R. G.; Nyaude, Ropafadzo; Caton, D. B.; Hamme, W. Van

doi:10.3847/0004-6256/152/6/199

2016

DOI: 10.3847/0004-6256/152/6/199

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Bvri Observations and Analyses of the Semidetached Binary Ff Vulpecula

R. G. Samec

Ropafadzo Nyaude

D. B. Caton

et al.

Abstract: High-precision light curves of FF Vul were taken during the fall of 2015 with the Dark Sky Observatory 0.81 m reflector of Appalachian State University, and the SARA north 0.91 m reflector at KPNO. FF Vul is an eclipsing binary with a period of 0.44 day. A Wilson–Devinney solution shows that the binary is a near-contact, semidetached binary, i.e., with a V1010 Oph-type configuration. Five eclipse timings (three primary and two secondary) were ca… Show more

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Investigation on the mass transferring near-contact binary TT Cet

Xiao-man

Chang²

2020

Publ. Astron. Soc. Aust.

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First multi-colour complete light curves and low-resolution spectra of short-period eclipsing binary TT Cet are presented. The stellar atmospheric parameters of the primary star were derived through spectra fitting as: $T_{eff}=7\,091\pm124\,{\text{K}}$ , $\log g = 4.15\pm0.33\,{\text{cm}}/\text{s}^2$ , and $[Fe/H]=-0.23\pm0.04\,\text{dex}$ . The light curves were analysed using the Wilson–Devinney code. The photometric solution suggests that this target should be a near-contact binary with the primary component filling its critical Roche lobe (i.e. SD1-type NCB). The luminosity enhancement around the primary light maximum (phase 0.10–0.40) on the light curve was detected like other SD1-type NCBs, which could be caused by a hot spot near the facing surface of the secondary component due to mass transfer. Long-term decrease of the orbital period at a rate of $dP/dt=-5.01\,({\pm}0.06)\times 10^{-8}\,{{\text{d}} \cdot{yr}}^{-1}$ was detected by the O–C analysis, which supports the mass transfer from the primary to the secondary and is consistent with its primary filling configuration. No third body was found through the light curve and O–C analysis. TT Cet may locate in the broken contact stage predicted by the thermal relaxation oscillation theory (TRO) and will evolve to the contact stage eventually. It is another good observational example supporting the TRO theory. We have collected all known SD1-type NCBs with absolute parameters from the literatures. The relations of these parameters are summarised for these rare systems.

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Investigation on the mass transferring near-contact binary TT Cet

Xiao-man

Chang²

2020

Publ. Astron. Soc. Aust.

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The first photometric investigation of the poor-thermal contact binary V749 Aurigae

Chang

Zhu

Sarotsakulchai

et al. 2022

Publications of the Astronomical Society of Japan

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The multi-filter light curve analysis of V749 Aurigae (thereinafter V0749 Aur) is conducted for the first time. Its orbital period is improved from P = 0.409873 to 0.409890 d in this work. The photometric data from the All-Sky Automated Survey for SuperNovae (ASAS-SN) were utilized to examine the revised orbital period. Then, the phased multi-filter light curves were computed with the new period, and analyzed with the Wilson–Devinney (W-D) code. The results reveal that V0749 Aur is a marginal contact binary with a large temperature difference of about ΔT = 1600 K. It is a poor thermal contact binary, the light curves of which depart from EW-type and show EB-type light variations. Thus, V0749 Aur belongs to a particular group of binaries, named B-type binaries, predicted by the Thermal Relaxation Oscillation (TRO) theory. In addition, the amplitude differences in different bands of the light curves, imply the existence of a third light. The contribution of the third light detected by the light curve analysis is consistent with the contribution of a visual star, which is in the same line of sight as V0749 Aur but at a different distance. With its marginal contact and short period properties, V0749 Aur merits further attention as a potential transitional sample in binary evolution.

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Bvri Observations and Analyses of the Semidetached Binary Ff Vulpecula

Cited by 2 publications

References 8 publications

Investigation on the mass transferring near-contact binary TT Cet

Investigation on the mass transferring near-contact binary TT Cet

The first photometric investigation of the poor-thermal contact binary V749 Aurigae

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