Optical Spectrum of Z UMi during its Maximum Light

Details Optical Spectrum of Z UMi during its Maximum Light Optical Spectrum of Z UMi during its Maximum Light

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..391...43k&link_type=abstract

Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, at Eberhard

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Scientific paper

Using the high resolution spectrograph NES of the 6 m telescope we obtained and analysed the spectra of the R CrB type star Z UMi. The atmospheric parameters were estimated: Teff=5250±250 K and log g=0.5±0.3. This places Z UMi among the coolest R CrB stars. We confirmed the hydrogen deficiency of Z UMi. The abundances of other elements resemble those found for the minority group of R CrB stars. We note a very low iron abundance, [Fe/H]=--1.85, and an essential excess of lithium, [Li/Fe]=+1.9.

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