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Title:
Chemical Abundances of Dwarf Galaxies in the M81 Group
Authors:
Croxall, Kevin V.; van Zee, L.; Lee, H.; Skillman, E. D.; Lee, J. C.; Côté, S.; Kennicutt, R. C., Jr.; Miller, B. W.
Affiliation:
AA(Indiana Univ), AB(Indiana Univ), AC(Gemini Observatory, Chile), AD(Univ. of Minnesota), AE(Carnegie Observatories), AF(Herzberg Institute of Astrophysics, Canada), AG(Univ. of Cambridge, United Kingdom), AH(Gemini Observatory, Chile)
Publication:
American Astronomical Society, AAS Meeting #213, #419.07; Bulletin of the American Astronomical Society, Vol. 41, p.235
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21341907C

Abstract

We have derived nebular abundances for 10 dwarf galaxies belonging to the M81 Group, including several galaxies which do not have abundances previously reported in the literature. For each field, multiple HII regions were observed with GMOS-N at the Gemini Observatory in order to determine abundances of several elements (oxygen, nitrogen, sulfur, neon, and argon). For most galaxies at least one HII region had a detection of the temperature sensitive [OIII] line, allowing a direct determination of the oxygen abundance. The observed oxygen abundances are typically in agreement with the well known metallicity-luminosity relation. In addition to the target galaxies, several fields included HII regions located well beyond the optical radius of nearby galaxies (e.g. NGC 3077 and M81). We will discuss possible origins of these chemically enriched HII regions which lie within the M81/NGC3077 tidal stream but are not associated with optically bright concentrations. This research was support by NSF grant AST05-06054.
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