光谱变星，亦称作猎犬座α型变星。许多A型特殊星(AP)和金属线星 (Am)在可见光波段的光度变化不大﹐但谱线强度有明显的周期性的变化﹐称为“光谱变星”。
这是通过观测比先前远得多的造父变星的可见光谱实现的，结果与地面望远镜观测结论类似。
This was accomplished by observing Cepheid variables at optical wavelengths out to greater distances than obtained previously and comparing those to similar measurements from ground-based telescopes.
SHOES团队使用哈勃望远镜的近红外相机和多目标光谱仪(NICMOS)、高级巡天相机(ACS)观测了综括7个星系的240颗造父变星。
The SHOES team used Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and the Advanced Camera for Surveys (ACS) to observe 240 Cepheid variable stars across seven galaxies.
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