标题： 走向北方地方组矮星系不规则星系变星的普查 显示英文标题

标题： Toward a Census of Variable Stars in Northern Local Group Dwarf Irregular Galaxies

摘要： 本星系群中的矮星系提供了一个独特的天体物理实验室。 特别是，它们使我们能够在金属丰度低于大麦哲伦云（SMC）的低金属丰度环境中探测脉动（及其他）变星。 我们观测计划的详细描述见C. Gössl的贡献章节，该计划产生了大量固有亮度很高的变星，可以作为这些星系恒星群体和恒星形成历史的探针。 最突出的是脉动变星，如米拉星（长周期变星）和$\delta$型造父变星，但我们还发现了其他类型的变星，例如： RV天鹅座型星、不规则红变星等。 我们为三个星系DDO 216、 仙后座A和GR8提供了初步的普查数据。 显示英文摘要

摘要： Dwarf galaxies in the local group provide a unique astrophysical laboratory. In particular, they allow us to probe pulsating (and other) variable stars in low-metallicity environments with abundances below that of the SMC. Our observing program, described in detail by C. G\"ossl's contribution, yields a large number of intrinsically bright variable stars that can serve as probes of the stellar population and star formation history of these galaxies. Most prominent are pulsation variables like Miras (LPVs) and $\delta$ Cep stars, but we also find other types of variable stars, e.g. RV Tauri stars, irregular red variables etc. We present a preliminary census for the three galaxies DDO 216, Leo A and GR8.