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HII Region Oxygen Abundances in Starbursting Transition Dwarf Galaxies | K. E. Dellenbusch
; J. S. Gallagher
; P. M. Knezek
; | Date: |
11 Dec 2006 | Abstract: | We present empirical HII region oxygen abundances for a sample of low-luminosity starburst galaxies which are in a short lived evolutionary state. All five galaxies are characterized by centrally concentrated star formation, which is embedded in smooth stellar envelopes resembling dE-like systems. The galaxies also have small gas contents with typical M_{HI}/L_{B} ~ 0.1 resulting in gas exhaustion timescales less than 1 Gyr, even when molecular gas is considered. We find, compared to other morphologically similar systems, the galaxies of this sample have surprisingly high oxygen abundances with 12 + log(O/H) ~ 9.0. We propose that these objects are a subclass of evolved blue compact dwarfs, which have exhausted most of their gas supply while retaining their metals. We further propose that we are seeing these objects during a short phase in which they are nearing the end of their starburst activity, and could become early-type dwarfs. | Source: | arXiv, astro-ph/0612292 | Services: | Forum | Review | PDF | Favorites |
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