V4142 Sgr：一个吸积盘周围有吸积体的双周期变星
V4142 Sgr: a Double Periodic Variable with an accretor surrounded by the accretion-disk's atmosphere
摘要：
内容：本文对密近相互作用双星V4142，Sgr进行了详细的光度和光谱分析，该系统属于一个神秘的类大陵变星，具有一个未知性质的长光度周期。目的：执行测光数据挖掘和光谱观测覆盖的轨道周期，我们得到的轨道参数和恒星的性质的双星系统，以及物理性质的吸积盘位于周围的热恒星。深入了解系统的演化路径。研究方法：利用双星系统的理论光变曲线，考虑两颗恒星和热星的吸积盘对光变曲线的贡献，采用逆模型方法对光变曲线进行建模，得到基本参数。为了限制主要的恒星参数的质量比是固定的，以及施主温度使用从我们的光谱分析，包括去混方法，以隔离恒星成分的谱线获得的值。系统参数与双星演化模型网格进行了比较，以了解系统的演化历史。结果：重新计算了轨道周期和长周期，发现轨道周期和长周期分别为$30.633 \pm 0.002 ~\mathrm{days}$和$1201 \pm 14 ~\mathrm{days}$。光谱分析揭示了H $α$双发射，并具有持续的$V \leq R$不对称性，这被认为是热点区域可能出现风的证据。
英文摘要：
Context: A detailed study of the close interacting binary V4142\,Sgr based on photometric and spectroscopic analysis is presented.This system belongs to the enigmatic class of Algol-like variables showing a long photometric cycle of unknown nature. Aims: Performing photometric data-mining and spectroscopic observations covering the orbital cycle, we obtain the orbital parameters and the stellar properties of the binary system, along with the physical properties of the accretion disk located around the hot star. Insights on the evolutive path of the system are obtained. Methods: The light curve was modeled through an inverse modeling method using a theoretical light curve of the binary system, considering the light curve contribution of both stars and the accretion disk of the hot star to obtain the fundamental parameters. To constrain the main stellar parameters the mass ratio was fixed, as well as the donor temperature using the obtained values from our spectroscopic analysis including deblending methods to isolate the spectral lines of the stellar components. The system parameters were compared with a grid of binary star evolutive models in order to get insights on the evolutionary history of the system. Results: The orbital period and the long cycle were re-calculated and found to be of $30.633 \pm 0.002 ~\mathrm{days}$ and $1201 \pm 14 ~\mathrm{days}$. The spectral analysis reveals H$α$ double emission with a persistent $V \leq R$ asymmetry which is considered evidence of a possible wind emergin from the hotspot region...
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