Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832904d&link_type=abstract
American Astronomical Society, AAS Meeting #218, #329.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Understanding the chemical composition of a galaxy is vital to tracing its global evolution. However, characterizing overall abundances for spirals poses a challenge since these galaxies tend to possess gradients in their chemical compositions. Here, a recent proposal for determining global oxygen abundances for spirals is explored and extended. By separately integrating the absolute amounts of hydrogen and oxygen within circles of increasing radii, it is shown that the overall oxygen abundance generally approaches an asymptote. The asymptote is a viable measure of the overall chemical state of a spiral, and allows for comparisons of the chemical evolution with respect to other galaxies, such as dwarf irregulars, whose chemistry is better understood.
Dack Stuart
McCall Marshall
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