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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >RW Doradus: A solar-type shallow contact binary with a new orbital period investigation
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RW Doradus: A solar-type shallow contact binary with a new orbital period investigation

机译：RW DORADUS：太阳能浅触点二进制，具有新的轨道周期调查

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摘要

New CCD photometric light curves of the short-period (P = 0.285 d) eclipsing binary RW Dor are presented. The observations were performed with the PROMPT-8 robotic telescope at CTIO in Chile between 2015 March and 2017 March. Other eclipse timings were obtained from the 2.15m JS telescope at CASLEO, San Juan, Argentina in 2011 December. Based on a light curve analysis, it is found that RW Dor is a W-type shallow contact binary with a fill-out factor f similar to 11% and a high mass ratio q similar to 1.587 (1/q = 0.63), where the hotter component is the less massive one (M-1 similar to 0.52 M-circle dot and M-2 similar to 0.82 M-circle dot). For orbital-period investigation, 15 new eclipse times and those previously published were compiled. O - C analysis with very weak evidence suggests that a long-term decrease in period with a rate of dP/dt = -9.61 x 10(-9) d yr(-1) is superimposed on a cyclic variation (A(3) = 0.0054 d and P-3 = 49.9 yr). The long-term decrease can be interpreted as mass transfer from the more massive component to the less massive one, or combined with angular momentum loss via magnetic braking. In addition, the marginal contact phase, high mass ratio (1/q > 0.4), and long-term decrease in period all suggest that RW Dor is a newly formed contact binary via Case A mass transfer, and it will evolve into a deeper normal contact binary. If the cyclic change is correct, the light travel-time effect via the presence of a cool third body will be a more plausible explanation for this.
机译：呈现了短时间的新CCD光度光曲线（P = 0.285 d）墨伐因rw dor。在2015年3月和2017年3月之间，在2015年3月至2017年3月在智利的Ctio-8机器人望远镜进行了观察。在2011年12月，阿根廷Casleo的2.15M JS望远镜获得了其他日食时间。基于光曲线分析，发现RW DOR是W型浅接触二进制二进制，其填充因子F类似于11％，高质量比Q类似于1.587（1 / Q = 0.63），其中更热的组件是较少的一种（M-1类似于0.52 m圆点和M-2类似于0.82 m圆点的M-2）。对于轨道周期调查，编制了15次新的日食时间和之前发表的那些。具有非常弱的证据表明，DP / DT = -9.61×10（-9）D YR（-1）率的时期长期减少叠加在循环变异上（a（3） = 0.0054 D和P-3 = 49.9 YR）。长期减少可以被解释为从更巨大的组分到较少的大量成分的质量转移，或者通过磁动制动结合角动量损耗。此外，边缘接触阶段，高质量比（1 / Q> 0.4），并且期间的长期减少均表明RW DOR通过案例传递进行了新形成的接触二进制，并且它将进化为更深正常接触二进制。如果循环变化是正确的，则通过阴凉第三体的存在将是一个更合理的解释。

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