论文标题
氦气富含热的热分子的苔丝光度法：BD+37 442和BD+37 1977中的R模式
TESS photometry of helium-rich hot subdwarfs: r modes in BD+37 442 and BD+37 1977
论文作者
论文摘要
极度富含氦的热分子BD+37 442和BD+37 1977的苔丝光度法显示，主周期分别为0.56和1.14 d，并且存在第一和第二谐波。光曲线不是完全规则的，这意味着额外的周期性和/或非周期性内容。检查了可能的原因，包括最初引入的二进制假设来解释X射线观测，差异旋转的表面不均匀性和脉动。如果主光度测定周期对应于旋转周期，则恒星分别以大约0.7和0.3 x的分裂旋转。因此，表面rossby波（R模式）提供了最可能的解决方案。
TESS photometry of the extremely helium-rich hot subdwarfs BD+37 442 and BD+37 1977 demonstrates multi-periodic low-amplitude variability with principal periods of 0.56 and 1.14 d, respectively, and with both first and second harmonics present. The lightcurves are not perfectly regular, implying additional periodic and/or non-periodic content. Possible causes are examined, including the binary hypothesis originally introduced to explain X-ray observations, differentially rotating surface inhomogeneities, and pulsations. If the principal photometric periods correspond to the rotation periods, the stars are rotating at approximately 0.7 and 0.3 x breakup, respectively. Surface Rossby waves (r modes) therefore provide the most likely solution.
