Spitzer/IRAC observations of SMC Cepheids

Using Spitzer observations of classical Cepheids we have measured the true average distance modulus of the Small Magellanic Cloud (SMC) to be 18.96+/-0.01_stat_+/-0.03_sys_mag...

基于斯皮策（Spitzer）望远镜对经典造父变星（classical Cepheids）的观测数据，我们测得小麦哲伦星系（Small Magellanic Cloud, SMC）的真实平均距离模数为18.96 ± 0.01（统计误差）± 0.03（系统误差）星等。