Very Large Excesses of 18 O in Hydrogen-deficient Carbon and R Coronae Borealis Stars: Evidence for White Dwarf Mergers
We have found that at least seven hydrogen-deficient carbon (HdC) and R Coronae Borealis (RGB) stars, have 16O/ 18O ratios close to and in some cases less than unity, values that are orders of magnitude lower than measured in other stars (the solar value
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