晚晚渐近巨星分支星的双星性：GALEX对紫外过量的搜索
Binarity in Cool Asymptotic Giant Branch Stars: A Galex Search for Ultraviolet Excesse
AI总结：
通过GALEX紫外观测发现9颗晚晚渐近巨星分支星存在远紫外过量，可能由热伴星或周围热吸积盘引起，为理解行星星云形态多样性提供新线索。
摘要：
对渐近巨星分支星的双星性搜索对理解行星星云多变的非球形形态至关重要。然而，由于这些星体的极高光度和脉动，检测双星伴星受到严重阻碍。我们通过GALEX紫外成像观测进行了小规模调查，这些冷星体在紫外光下非常暗淡，以寻找更热的伴星。我们报告了九颗星体的显著远紫外过量。远紫外过量很可能直接由热双星伴星存在，或间接由围绕伴星的热吸积盘引起。
英文摘要：
The search for binarity in AGB stars is of critical importance for our understanding of how planetary nebulae acquire the dazzling variety of aspherical shapes which characterises this class. However, detecting binary companions in such stars has been severely hampered due to their extreme luminosities and pulsations. We have carried out a small imaging survey of AGB stars in ultraviolet light (using GALEX) where these cool objects are very faint, in order to search for hotter companions. We report the discovery of significant far-ultraviolet excesses towards nine of these stars. The far-ultraviolet excess most likely results either directly from the presence of a hot binary companion, or indirectly from a hot accretion disk around the companion.
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