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Photometric investigation on the W-subtype contact binary V1197 Her

Research in Astronomy and Astrophysics 2020年第1期20卷 77-82页

作者： Xiao Zhou boonrucksar soonthomthum Yunnan Observatories Chinese Academy of SciencesKunming 650216China National Astronomical Research Institute of Thailand 260 Moo 4T.DonkaewA.MaerimChiangmai50180Thailand Key Laboratory of the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China

Multi-color light curves of V1197 Her were obtained with the 2.4 meter optical telescope at the Thai National Observatory and the Wilson-Devinney(W-D)program was used to model the observational light *** photometric solutions reveal that V1197 Her is a W-subtype shallow contact binary system with a mass ratio of q=2.61 and a fill-out factor of f=15.7%.The temperature difference between the primary star and secondary star is only 140 K in spite of the low degree of contact,which means that V1197 Her is not only in geometrical contact configuration but is also already under thermal contact *** orbital inclination of V1197 Her is as high as i=82.7?,and the primary star is completely eclipsed at the primary *** totally eclipsing characteristic implies that the determined physical parameters are highly *** masses,radii and luminosities of the primary star(star 1)and secondary star(star2)are estimated to be M1=0.30(1)M⊙,M2=0.77(2)M⊙,R1=0.54(1)R⊙,R2=0.83(1)R⊙,L1=0.18(1)L⊙and L2=0.38(1)L⊙.The evolutionary statuses of the two component stars are drawn in the Hertzsprung-Russell diagram,showing that the less massive but hotter primary star is more evolved than the secondary *** period of V1197 Her is decreasing continuously at a rate of d P/dt=-2.58×10^-7 day·year^-1,which can be explained by mass transfer from the more massive star to the less massive one at a rate of dM2/dt=-1.61×10^-7 M⊙year^-*** light curves of V1197 Her are reported to show the O’Connell ***,a cool spot is added to the more massive star to model the asymmetry in the light curves.

关键词： techniques:photometric binaries:eclipsing stars:fundamental parameters

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A Photometric Study of the Near Contact Binary UU Lyncis

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Chinese Journal of Astronomy and Astrophysics 2007年第2期7卷 251-257页

作者： Li-Ying Zhu Sheng-Bang Qian 1,2 soonthomthum boonrucksar Jia-JiaHe Jin-Zhao Yuan National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming650011 United Laboratory of Optical Astronomy Chinese Academy of Sciences （ULOAC）. 100012 Beijing Graduate School of Chinese Academy of Sciences ＂ Beijing 100049 Department of Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

The near-contact binary UU Lyn with an F3V-type primary was observed in 2005 and 2006. With the latest version of the Wilson-Devinney code, the photometric elements were computed. The results reveal that UU Lyn is a marginal contact system with a large temperature difference of about 1900 K between the primary and secondary components. All available eclipse times, including new ones, were used in the analysis. The results show that the orbital period of this system undergoes a continuous decrease at a rate of dP/dt = -1.84 × 10^-8 d yr^-1. With the period decrease, UU Lyn may evolve from the present shortperiod marginal contact system into a contact system with true thermal contact. This target might just be undergoing the cycles predicted by the theory of thermal relaxation oscillations （TRO）. It is an interesting example resembling BL And, GW Tau, ZZ Aur, KQ Gem, CN And and AD Cnc, that lie in the key evolutionary stage.

关键词： techniques photometric- binaries eclipsing - stars individual UU Lyncis

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An orbital period investigation of the Algol-type eclipsing binary VW Hydrae

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Chinese Journal of Astronomy and Astrophysics 2009年第3期9卷 307-314页

作者： Jia Zhang Sheng-Bang Qian boonrucksar soonthomthum National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China National Astronomical Research Institute of Thailand/Ministry of Science and Technology Bangkok Thailand

Orbital period variations of the Algol-type eclipsing binary, VW Hydrae, are analyzed based on one newly determined eclipse time and the other times of light minima collected from the literature. It is discovered that the orbital period shows a continuous increase at a rate ofdP/dt = ＋6.34 × 10^-7 d yr^-1 while it undergoes a cyclic change with an amplitude of 0.0639 d and a period of 51.5 yr. After the long-term period increase and the large-amplitude period oscillation were subtracted from the O-C curve, the residuals of the photoelectric and CCD data indicate a small-amplitude cyclic variation with a period of 8.75 yr and a small amplitude of 0.0048 d. The continuous period increase indicates a conservative mass transfer at a rate of dM2/dt = 7.89 × 10^-8 M⊙ yr^-1 from the secondary to the primary. The period increase may be caused by a combination of the mass transfer from the secondary to the primary and the angular momentum transfer from the binary system to the circumbinary disk. The two cyclic period oscillations can be explained by light-travel time effects via the presence of additional bodies. The small-amplitude periodic change indicates the existence of a less massive component with mass M3 〉 0.53 M⊙, while the large-amplitude one is caused by the presence of a more massive component with mass M4 〉 2.84M⊙. The ultraviolet source in the system reported by Kviz ＆ Rufener （1987） may be one of the additional components, and it is possible that the more massive one may be an unseen neutron star or black hole. The rapid period increase and the possibility of the presence of two additional components in the binary make it a very interesting system to study. New photometric and high-resolution spectroscopic observations and a detailed investigation of those data are required in the future.

关键词： stars binaries close - stars binaries eclipsing - multiple stars - stars individual (VW Hya)

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