In twelve hydrogen-deficient carbon stars, all six dustless stars have more oxygen-18 than oxygen-16 while all six RCB stars have the opposite, with a proposed but confounded temperature trend.
L., Nikultsev, N., Clayton, G
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Oxygen Isotope Ratios in Hydrogen-Deficient Carbon Stars: A Correlation with Effective Temperature and Implications for White Dwarf Merger Outcomes
In twelve hydrogen-deficient carbon stars, all six dustless stars have more oxygen-18 than oxygen-16 while all six RCB stars have the opposite, with a proposed but confounded temperature trend.