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首页> 外文期刊>The Astronomical journal >Period changes and four-color light curves of the active overcontact binary V396 monocerotis
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Period changes and four-color light curves of the active overcontact binary V396 monocerotis

机译：Period changes and four-color light curves of the active overcontact binary V396 monocerotis

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This paper analyzes the first obtained four-color light curves of V396 Mon using the 2003 version of theW-D code. It is confirmed that V396 Mon is a shallow W-type contact binary system with a mass ratio q = 2.554(±0.004) and a degree of contact factor f = 18.9(±1.2). A period investigation based on all available data shows that the period of the system includes a long-term decrease (dP/dt = ?8.57 × 10~(?8) days yr~(?1)) and an oscillation (A_3 = 0.0160 day, T_3 = 42.4 yr). They are caused by angular momentum loss and light-time effect, respectively. The suspect third body is possibly a small M-type star (about 0.31 solar mass). Though some observations indicate that this system has strong magnetic activity, by our analysis we found that the Applegatemechanism cannot explain the periodic changes. This binary is an especially important system according to Qian's statistics of contact binaries as its mass ratio lies near the proposed pivot point about which the physical structure of contact binaries supposedly oscillates.

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