缺氢碳星有风吗？
Do Hydrogen-deficient Carbon Stars have Winds?
摘要：
我们目前的高分辨率光谱的五个已知的氢缺乏碳（HdC）恒星在附近的10830埃线的中性氦。在北冕座R（RCB）恒星中，He I线被认为是强而宽的，通常具有天鹅座P的轮廓，并且必须在这些恒星的强大风中形成。RCB星的化学丰度与HdC星相似，并且18 O丰度也大大增强，这表明这两类恒星有共同的起源，被认为是白矮星合并。一条狭窄的He I吸收线可能存在于较热的HdC恒星中，但在较冷的恒星中看不到任何线，并且在任何一颗恒星中都没有发现风的证据。RCB星中风线的存在与尘埃形成事件密切相关，因此HdC星中没有风线，这并不产生尘埃，这是预期的。
英文摘要：
We present high resolution spectra of the five known hydrogen-deficient carbon (HdC) stars in the vicinity of the 10830 Angstrom line of neutral helium. In R Coronae Borealis (RCB) stars the He I line is known to be strong and broad, often with a P Cygni profile, and must be formed in the powerful winds of those stars. RCB stars have similar chemical abundances as HdC stars and also share greatly enhanced 18O abundances with them, indicating a common origin for these two classes of stars, which has been suggested to be white dwarf mergers. A narrow He I absorption line may be present in the hotter HdC stars, but no line is seen in the cooler stars, and no evidence for a wind is found in any of them. The presence of wind lines in the RCB stars is strongly correlated with dust formation episodes so the absence of wind lines in the HdC stars, which do not make dust, is as expected.
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