Peekaboo, a nearby dwarf galaxy, has its oxygen abundance measured as 12+log(O/H)=6.99±0.06, making it the lowest-metallicity dwarf in the Local Volume measured with the direct method.
et al., 2010, in Silva D
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The Peekaboo galaxy: new SALT spectroscopy and implications of archive HST data
Peekaboo, a nearby dwarf galaxy, has its oxygen abundance measured as 12+log(O/H)=6.99±0.06, making it the lowest-metallicity dwarf in the Local Volume measured with the direct method.