论文标题
Gaia RR Lyrae在附近的超生物矮人卫星星系中星星
Gaia RR Lyrae Stars in Nearby Ultra-Faint Dwarf Satellite Galaxies
论文作者
论文摘要
我们使用RR Lyrae Stars的Gaia DR2目录，在附近27个附近27个搜索RR Lyrae Stars（$ <100 $ kpc）搜索超品种的卫星星系。根据适当的动作，大小和天空的位置，我们将47 Gaia rr Lyrae星星与14个不同的卫星相关联。为这些星系提供了基于RR Lyrae星星的距离。我们在图卡纳II矮星系中首次确定了RR Lyrae明星，并在Ursa Major II，Coma Berenices，Hydrus I，Bootes I和Bootes III中找到了其他成员。此外，我们在六个星系中确定了候选潮流的RR Lyre恒星，这表明它们可能正在遭受潮汐破坏。我们发现10个星系在盖亚（Gaia）和文献中都没有RR Lyrae星。但是，鉴于Gaia DR2的已知完整性我们无法得出结论这些星系确实缺乏这种类型的可变星。
We search for RR Lyrae stars in 27 nearby ($<100$ kpc) ultra-faint dwarf satellite galaxies using the Gaia DR2 catalog of RR Lyrae stars. Based on proper motions, magnitudes and location on the sky, we associate 47 Gaia RR Lyrae stars to 14 different satellites. Distances based on RR Lyrae stars are provided for those galaxies. We have identified RR Lyrae stars for the first time in the Tucana II dwarf galaxy, and find additional members in Ursa Major II, Coma Berenices, Hydrus I, Bootes I and Bootes III. In addition we have identified candidate extra-tidal RR Lyrae stars in six galaxies which suggest they may be undergoing tidal disruption. We found 10 galaxies have no RR Lyrae stars neither in Gaia nor in the literature. However, given the known completeness of Gaia DR2 we cannot conclude these galaxies indeed lack variable stars of this type.
