GG船底座：B[e]超巨星双星中1.583天轨道相位相关周期的发现
GG Carinae: Discovery of orbital phase dependent 1.583-day periodicities in the B[e] supergiant binary
摘要：
船底座GG是一颗双星，其主要成分是B[e]超巨星。利用TESS、ASAS、OMC和ASAS-SN的测光资料和Global Jet Watch的光谱资料，研究了GG Car的可见He，I，Fe，II和Si，II谱线的短周期变化。我们发现了一个迄今为止被忽视的周期性$1.583156\pm0.0002$ \，天，是目前在其光度和径向速度的发射线，旁边的变化，在完善的$\sim$ 31天的轨道周期。我们发现，在测光和一些发射线的短周期变化的幅度调制的轨道相位的二进制，这样的短周期变化具有最大的振幅时，二进制是在近星点。在整个轨道周期内，短周期变化的相位没有显著变化。我们调查的1.583天的变化的潜在原因，并发现所观察到的周期与预期的$l=2$ f-模式的主要考虑其质量和半径的周期一致。我们认为，当主星位于双星偏心轨道（$e=0.5$）的近星点附近时，主星被四极潮汐力周期性地拉出流体静力平衡，并且主星几乎充满了洛希瓣。这导致在$l=2$ f模式频率下的振荡，该振荡随着组件之间的距离增加而衰减。
英文摘要：
GG Carinae is a binary whose primary component is a B[e] supergiant. Using photometric data from TESS, ASAS, OMC, and ASAS-SN, and spectroscopic data from the Global Jet Watch to study visible He\,I, Fe\,II and Si\,II emission lines, we investigate the short-period variations which are exhibited in GG Car. We find a hitherto neglected periodicity of $1.583156\pm0.0002$\,days that is present in both its photometry and the radial velocities of its emission lines, alongside variability at the well-established $\sim$31-day orbital period. We find that the amplitudes of the shorter-period variations in both photometry and some of the emission lines are modulated by the orbital phase of the binary, such that the short-period variations have largest amplitudes when the binary is at periastron. There are no significant changes in the phases of the short-period variations over the orbital period. We investigate potential causes of the 1.583-day variability, and find that the observed period agrees well with the expected period of the $l=2$ f-mode of the primary given its mass and radius. We propose that the primary is periodically pulled out of hydrostatic equilibrium by the quadrupolar tidal forces when the components are near periastron in the binary's eccentric orbit ($e=0.5$) and the primary almost fills its Roche lobe. This causes an oscillation at the $l=2$ f-mode frequency which is damped as the distance between the components increases.
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