On the Hydrogen Deficient Nature of Z UMi

Details On the Hydrogen Deficient Nature of Z UMi On the Hydrogen Deficient Nature of Z UMi

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109..796g&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.109, p.796-798

Other

11

Stars: Variables: Other, Stars: Abundances

Scientific paper

Z Ursa Minoris was classified by Benson et al. (1994) a a R Coronae Borealis (RCB) variable star from its light variations. Hydrogen deficiency, which is a defining feature of RCB stars, was not established. To investigate this aspect we have obtained high resolution spectra in both blue (4200-4630\AA) and red (5050-7950\AA) regions. Lines of the CH molecule (G band) at about 4300\AA, which are present in spectra of N-type carbon stars are weak or absent in the spectrum of Z UMi indicating its hydrogen deficient nature and membership of the rare class of RCB variables. (SECTION: Stars)

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