两个后公共包层双星系统的研究
Studies of Two Post Common Envelope Binary Stars
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中文总结 AI 辅助
本研究通过测光和光谱分析，揭示了两个后公共包层双星（ZTF~0329和ATL~0602）的物理特性，包括白矮星质量下限、光变曲线演化，并发现ZTF~0329为低吸积率极化源，ATL~0602红矮星存在冷斑。
中文摘要 AI 辅助
本文展示了短周期（$P<0.2$天）双星系统ZTF~J032906.36+070408.3（ZTF~0329）和ATO~J090.7238+00.5996（ATL~0602）的新时序测光数据。两个系统中的主星（较热）均为白矮星，而较冷的伴星为M矮星。利用档案测光数据以及新的和档案光谱数据，推导了这两个双星系统中各组分的温度。两者均为单线双星系统。将速度曲线拟合到红矮星的视向速度测量值，并以此确定白矮星质量的下限。新的和档案时序测光数据显示，这两颗恒星的光变曲线形状存在演化。ZTF~0329的光谱在$R_C$波段表现出过量的辐射，这归因于电子回旋辐射，表明该恒星是一个低吸积率的极化源。对ATL~0602的多滤光片光变曲线进行满意的模型拟合，需要在其红矮星组分上存在冷斑。后者在单个光谱中表现出与Balmer线和Ca~II发射线相关的多种速度。
英文摘要
New time series photometry of the short period ($P<0.2$~d) binary stars ZTF~J032906.36+070408.3 (ZTF~0329) and ATO~J090.7238+00.5996 (ATL~0602) is presented. The primary (hotter) stars in both systems are white dwarfs, while the cooler stars are M dwarfs. Archival photometry and new and archival spectra are used to derive the temperatures of the components in the two binaries. Both are single-lined binaries. Velocity curves are fitted to radial velocity measurements of the red dwarfs and used to place lower limits on the masses of the white dwarfs. New and archival time series photometry show evolution in the shapes of the light curves of both stars. Spectra of ZTF~0329 show an excess of radiation in the $R_C$ band which is ascribed to electron cyclotron radiation, suggesting that the star is a low accretion rate polar. Satisfactory model fits to the multi-filter light curves of ATL~0602 require the presence of cool spots on the red component of the binary. The latter star exhibits a variety of velocities associated with Balmer and Ca~II emission lines within individual spectra.
发表机构
- University of the Western Cape（西开普敦大学）
- South African Astronomical Observatory（南非天文台）
- Southern African Large Telescope（南非大型望远镜）
- Sternberg Astronomical Institute, Lomonosov Moscow State University（莫斯科国立大学斯特恩伯格天体物理研究所）
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