Z Umi: A Critical Test of the formation path(s) of R Coronae Borealis Stars

Details Z Umi: A Critical Test of the formation path(s) of R Coronae Borealis Stars Z Umi: A Critical Test of the formation path(s) of R Coronae Borealis Stars

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop...85c&link_type=abstract

NOAO Proposal ID #2011A-0085

Physics

Scientific paper

We request 0.5 hours of time on NIRI/Gemini North to follow up on one key aspect of our discovery of extreme 18O enrichment in hydrogen-deficient carbon stars and R Coronae Borealis (RCB) stars in the Galaxy (Clayton et al. 2005, 2007). The proposed observation would consist of a high S/N medium resolution GNIRS spectrum of the CO bands in the RCB star, Z UMi to confirm a previous marginal detection of a large abundance of 18O in it. Z UMi may be unique in possessing measurable amounts of both 18O and Li among the RCB stars. If an RCB star is found that has both a high Li abundance and a high 18O abundance, it would force a re-evaluation of the proposed scenarios for the formation of the RCB stars. The proposed Gemini observations will provide a definitive answer to whether an RCB star can have both Li and highly overabundant 18O.

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