Oxygen Abundances in Starbursting Transition Dwarfs

Details Oxygen Abundances in Starbursting Transition Dwarfs Oxygen Abundances in Starbursting Transition Dwarfs

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916708d&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #167.08; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We present HII region oxygen abundances for five starbursting low-luminosity galaxies. The sample was selected to have central starbursts with transition dwarf morphologies, i.e. the starbursts are embedded in smooth stellar envelopes resembling dE-like systems. We further selected our sample to have low MHI/LB < 0.1. Objects in this sample are candidates for being near the end of their star forming careers, as gas exhaustion timescales are < 1 Gyr. These systems have surprisingly high oxygen abundances, with values near solar. Evidently the starburst came from internal gas and a significant fraction of the synthesized metals are retained. We propose that these objects are a subclass of low-gas content blue compact dwarfs (BCDs), which have retained their metals and are now nearing the end of their starburst phase.
This research is supported in part by NSF grant AST 98-03018 and the University of Wisconsin Graduate School.

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