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We present an analysis of the effects of spectral resolution and aperturescales on derived galaxy properties using far-ultraviolet (FUV) spectra oflocal star-forming galaxies from the International Ultraviolet Explorer (R~250,FOV~10"x20") and Cosmic Origins Spectrograph on the Hubble Space Telescope(R~15,000, FOV~2.5"). Using these spectra, we measured FUV luminosities,spectral slopes, dust attenuation, and equivalent widths. We find that galaxieswith one dominant stellar cluster have FUV properties that are independent ofaperture size, while galaxies with multiple bright clusters are sensitive tothe total light fraction captured by the aperture. Additionally, we findsignificant correlations between the strength of stellar and interstellarabsorption-lines and metallicity, indicating metallicity-dependent line-drivenstellar winds and interstellar macroscopic gas flows shape the stellar andinterstellar spectral lines, respectively. The observed line-strength versusmetallicity relation of stellar-wind lines agrees with the prediction ofpopulation synthesis models for young starbursts. In particular, measurementsof the strong stellar CIV 1548,1550 line provide an opportunity to determinestellar abundances as a complement to gas-phase abundances. We provide arelation between the equivalent width of the CIV line and the oxygen abundanceof the galaxy. We discuss this relation in terms of the stellar-wind propertiesof massive stars. As the driving lines in stellar winds are mostly ionized ironspecies, the CIV line may eventually offer a method to probealpha-element-to-iron ratios in star-forming galaxies once consistent modelswith non-solar abundance ratios are available. These results have importantimplications for the galaxy-scale, low-resolution observations of high-redshiftgalaxies from JWST (R~100-3,500).

Aperture and Resolution Effects on Ultraviolet Star-Forming Properties: Insights from Local Galaxies and Implications for High-Redshift Observations