SIMBAD references

2003AJ....125..146L - Astron. J., 125, 146-165 (2003/January-0)

Uncovering additional clues to galaxy evolution. I. Dwarf irregular galaxies in the field.


Abstract (from CDS):

In order to recognize environmental effects on the evolution of dwarf galaxies in clusters of galaxies, it is first necessary to quantify the properties of objects that have evolved in relative isolation. With oxygen abundance as the gauge of metallicity, two key diagnostics of the evolution of dwarf irregular galaxies in the field are reexamined: the metallicity-luminosity relationship and the metallicity-gas fraction relationship. Gas fractions are evaluated from the masses of luminous components only, i.e., constituents of the nucleogenetic pool.
Result. from new optical spectroscopy obtained for H II regions in five dwarf irregular galaxies in the local volume are incorporated into a new analysis of field dwarfs with [O III] λ4363 detections and good distances. The updated fit to the metallicity-luminosity relationship is consistent with results reported in the literature. The fit to the metallicity-gas fraction relation shows an excellent correlation consistent with expectations of the simple ``closed box'' model of chemical evolution. The simplest explanation consistent with the data is that flow rates are zero, although the observations allow for the possibility of modest flows. The derived oxygen yield is one-quarter of the value for the solar neighborhood.

Abstract Copyright:

Journal keyword(s): Galaxies: Abundances - Galaxies: Dwarf - Galaxies: Evolution - Galaxies: Irregular

Nomenclature: Table 6: [LMK2003] Ho II-N (Nos 1-5). Table 7: [LMK2003] IC 10-N (Nos 1-6). Table 8: [LMK2003] NGC 1560-N (Nos 1-7). Table 9: [LMK2003] NGC 3109-N (Nos 1-4). Table 10: [LMK2003] UGC 6456-N (Nos 1-2).

CDS comments: Objects DDO 187-N are [VHS97] UGC 9128-N in SIMBAD.

Simbad objects: 59

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