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arXiv 1104.3428astro-ph.SR
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食双星中的旋转多普勒波束

Rotational Doppler beaming in eclipsing binaries

Paul J. Groot

摘要:

在食双星中,当食入和食出时,两个分量的恒星旋转将导致旋转多普勒波束,只有部分食入分量被覆盖。对于具有快速旋转组件的食双星,这种光度类似于著名的光谱Rossiter-McLaughlin效应,可以超过轨道效应的强度。光变曲线的例子显示了一个分离的双白矮星双星,一个大质量的O型双星和一个过境的系外行星的情况下,类似于WASP-33 b。包含在食系统中的旋转多普勒波束是从拟合高质量的光度光变曲线导出正确的恒星参数的先决条件,并且可以用于确定恒星的质量以及例如在那些可能被期望完全同步的系统中的旋转速度的独立测量。

英文摘要:

In eclipsing binaries the stellar rotation of the two components will cause a rotational Doppler beaming during eclipse ingress and egress when only part of the eclipsed component is covered. For eclipsing binaries with fast spinning components this photometric analogue of the well-known spectroscopic Rossiter-McLaughlin effect can exceed the strength of the orbital effect. Example light curves are shown for a detached double white dwarf binary, a massive O-star binary and a transiting exoplanet case, similar to WASP-33b. Inclusion of the rotational Doppler beaming in eclipsing systems is a prerequisite for deriving the correct stellar parameters from fitting high quality photometric light curves and can be used to determine stellar obliquities as well as e.g. an independent measure of the rotational velocity in those systems that may be expected to be fully synchronized.

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