Oxygen Isotopic Ratios in Cool R Coronae Borealis Stars

  title={Oxygen Isotopic Ratios in Cool R Coronae Borealis Stars},
  author={D. A. Garc{\'i}a-Hern{\'a}ndez and D. Lambert and N. Rao and K. Hinkle and K. Eriksson},
  journal={The Astrophysical Journal},
  • D. A. García-Hernández, D. Lambert, +2 authors K. Eriksson
  • Published 2010
  • Physics
  • The Astrophysical Journal
  • We investigate the relationship between R Coronae Borealis (RCB) stars and hydrogen-deficient carbon (HdC) stars by measuring precise O-16/O-18 ratios for five cool RCB stars. The O-16/O-18 ratios are derived by spectrum synthesis from high-resolution (R similar to 50,000) K-band spectra. Lower limits to the O-16/O-17 and N-14/N-15 ratios as well as Na and S abundances (when possible) are also given. RCB stars in our sample generally display less O-18 than HdC stars-the derived O-16/O-18 ratios… CONTINUE READING
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