An Extremely Large Excess of 18 O in the Hydrogen-Deficient Carbon Star , HD 137613


We report the discovery of a uniquely large excess of O in the hydrogendeficient carbon (HdC) star, HD 137613, based on a spectrum of the first overtone bands of CO at 2.3-2.4 μm in which three strong absorption bands of CO are clearly present. Bands of CO also are present but no bands of CO or CO are seen. We estimate an isotopic ratio O/O <∼ 1. The Solar… (More)


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