小质量裸奇异星的r模不稳定性研究

R-mode Instability of Low-mass Bare Strange Stars

在修正袋模型参数所允许的范围内构建奇异星模型,研究了小质量裸奇异星的r模不稳定窗口.结果表明随着星体质量的减小,r模不稳定性所约束的奇异星极限旋转频率增大;根据参数选取的不同,质量在约0.1～0.2 M⊙以下的裸奇异星都可以解释观测到的转速最快的716 Hz脉冲星数据.

The r-mode instability window of low-mass strange stars is studied using the modified bag model of strange quark matter and reasonable sets of parameters. The results show that the spin frequency limit of strange stars increases with the decrease of their mass, and the highest observed spin frequency （716 Hz） of pulsars can be explained if the strange star mass is lower than about 0.1-0.2 M⊙, depending on the parameters of the equation of state.