The origin and evolution of hydrogen-deficient stars are not yet adequately understood. Their chemical peculiarities, along with hydrogen-deficiency, makes them stand out from the rest and sheds light on their possible origin. Severe fluorine enrichment (of the order of 800–8000) is one such characteristic feature of a class of hydrogen deficient stars, mainly the RCBs (R Coronae Borealis stars) and cool EHes (Extreme Helium stars) which enforces their close connection. For hot EHes, this relationship with the cooler EHes, based on their fluorine abundance is unexplored. Here, first estimates of fluorine abundances in hot EHes are presented and discussed in the light of their cooler counterparts to try to establish an evolutionary connection. The relation between these fluorine estimates with the other elemental abundances observed in these stars plays a pivotal role to predict the formation and evolution of these exotic stars.

中文翻译：

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热极氦星中的氟探测

缺氢恒星的起源和演化尚未得到充分了解。它们的化学特性以及氢缺乏使它们脱颖而出，并揭示了它们可能的起源。严重的氟富集（800-8000 数量级）是一类缺氢恒星的特征之一，主要是 RCB（R Coronae Borealis 星）和冷 EHes（极氦星），它们加强了它们的紧密联系。对于热 EHes，这种与较冷 EHes 的关系（基于它们的氟丰度）尚未探索。在这里，根据较冷的对应物介绍和讨论了热 EHe 中氟丰度的初步估计，以试图建立进化联系。