The Orbital Nature of 81 Ellipsoidal Red Giant Binaries in the Large Magellanic Cloud

The Orbital Nature of 81 Ellipsoidal Red Giant Binaries in the Large Magellanic Cloud
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大麦哲伦星云中 81 个椭球红巨星双星的轨道性质

DOI:
10.3847/1538-4357/835/2/209
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发表时间:
2017-01
期刊:
The Astrophysics Journal
影响因子:
--
通讯作者:
Nicholls C.P
Nicholls C.P
中科院分区:
其他
文献类型:
--
作者:
Nie J.D;Wood P.R;Nicholls C.P

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本文收集了大麦哲伦星云中81颗椭球红巨星双星的样本,对它们的轨道性质进行了单独的统计研究。样本包括59个圆形轨道系统和22个偏心轨道系统。我们使用2010年版本的Wilson-Devinney代码推导出轨道解。样本的选择偏差校正,轨道参数分布进行了比较,模型预测的LMC和在太阳附近的观测。红巨星主星系的质量范围在0.6到9之间,峰值在1.5左右,这与对大麦哲伦星系星星形成历史的研究一致,后者发现星星形成的爆发开始于大约4 Gyr前。观测到的质量比分布与Raghavan等人推导出的太阳附近的平坦q分布比与Duquennoy & Mayor推导出的太阳附近q分布更一致。没有证据表明具有相同质量组件的系统数量过多。我们发现,约20%的椭球双星偏心轨道,两倍的分数估计Soszynski等人。我们的偏心率演化测试表明,偏心椭球红巨星双星的存在上部分的红巨星分支(RGB)只能解释,如果潮汐循环率是10.1/100的速率给出的通常理论的潮汐耗散对流星。
In this paper, we collect a sample of 81 ellipsoidal red giant binaries in the Large Magellanic Cloud (LMC), and we study their orbital natures individually and statistically. The sample contains 59 systems with circular orbits and 22 systems with eccentric orbits. We derive orbital solutions using the 2010 version of the Wilson–Devinney code. The sample is selection-bias corrected, and the orbital parameter distributions are compared to model predictions for the LMC and to observations in the solar vicinity. The masses of the red giant primaries are found to range from about 0.6 to 9 with a peak at around 1.5 , in agreement with studies of the star formation history of the LMC, which find a burst of star formation beginning around 4 Gyr ago. The observed distribution of mass ratios is more consistent with the flat q distribution derived for the solar vicinity by Raghavan et al. than it is with the solar vicinity q distribution derived by Duquennoy & Mayor. There is no evidence for an excess number of systems with equal mass components. We find that about 20% of the ellipsoidal binaries have eccentric orbits, twice the fraction estimated by Soszynski et al. Our eccentricity evolution test shows that the existence of eccentric ellipsoidal red giant binaries on the upper parts of the red giant branch (RGB) can only be explained if tidal circularization rates are ∼1/100 the rates given by the usual theory of tidal dissipation in convective stars.
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影响因子: 4.8
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影响因子: --
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