A cool R Coronae Borealis star Z UMi

Details A cool R Coronae Borealis star Z UMi A cool R Coronae Borealis star Z UMi

2007-06-22

arxiv.org/abs/0706.3271v1

BalticAstron.15:531-537,2006

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures, 2 tables

Scientific paper

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

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