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Very Large Excesses of 18O in Hydrogen-Deficient Carbon and R Coronae Borealis Stars: Evidence for White Dwarf Mergers

ASTROPHYSICAL JOURNAL, no. 2 (2007): 1220-1230

Cited: 125|Views27

Abstract

We have found that at least seven hydrogen-deficient carbon ( HdC) and R Coronae Borealis ( RCB) stars, have O-16/O-18 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 is 500). Greatly enhanced O-18 is evident in every HdC and RCB we have measured t...More

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