Carbon-rich, Extremely Metal-Poor Population II stars

Ryan, Sean G. (2003) Carbon-rich, Extremely Metal-Poor Population II stars. In: Procs of CNO in the universe : ASP Conf Series 304. Astronomical Society of the Pacific, pp. 128-132. ISBN 1-58381-153-2
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A significant fraction of very metal-poor stars have unexpectedly high carbon abundances. I recap on their discovery, describe the results of high-resolution spectroscopic studies of their composition, and consider possible origins. It is now clear that at least two, and possibly three different explanations are needed for their general characteristics.


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