A Mechanism for Orbital Period Modulation in Close Binaries
A Mechanism for Orbital Period Modulation in Close Binaries
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DOI：
10.1086/170967
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发表时间：
1992-02
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影响因子：
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通讯作者：
J. H. Applegate
中科院分区：
文献类型：
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作者：
J. H. Applegate
观察到一些食变星在几十年或更长的时间尺度上经历了幅度为Δ、P/P、∼10、−5的轨道周期调制。这些调制可以通过轨道与系统中磁性活跃恒星形状变化的引力耦合来解释。活动星的可变形变是由于恒星在其活动周期中角动量分布的变化而产生的。这种机制通常要求活动星在ΔL/L⇒0.1级别可变，并在ΔΩ/Ω⇒0.01级别差分旋转
Some eclipsing variables are observed to undergo orbital period modulations of amplitude ΔP/P∼10 −5 over time scales of decades or longer. These modulations can be explained by the gravitational coupling of the orbit to variations in the shape of a magnetically active star in the system. The variable deformation of the active star is produced by variations in the distribution of angular momentum as the star goes through its activity cycle. This mechanism typically requires that the active star be variable at the ΔL/L⇒0.1 level, and be differentially rotating at the ΔΩ/Ω⇒0.01 level