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We have derived nebular abundances for 10 dwarf galaxies belonging to the M81Group, including several galaxies which do not have abundances previouslyreported in the literature. For each galaxy, multiple H \ii regions wereobserved with GMOS-N at the Gemini Observatory in order to determine abundancesof several elements (oxygen, nitrogen, sulfur, neon, and argon). For sevengalaxies, at least one H \ii region had a detection of the temperaturesensitive [OIII] $\lambda$4363 line, allowing a "direct" determination of theoxygen abundance. No abundance gradients were detected in the targeted galaxiesand the observed oxygen abundances are typically in agreement with the wellknown metallicity-luminosity relation. However, three candidate "tidal dwarf"galaxies lie well off this relation, UGC 5336, Garland, and KDG 61. The natureof these systems suggests that UGC 5336 and Garland are indeed recently formedsystems, whereas KDG 61 is most likely a dwarf spheroidal galaxy which liesalong the same line of sight as the M81 tidal debris field. We propose thatthese H \ii regions formed from previously enriched gas which was stripped fromnearby massive galaxies (e.g., NGC 3077 and M81) during a recent tidalinteraction.

Chemical Abundances of Seven Irregular and Three Tidal Dwarf Galaxies in the M81 Group