Fig. 4.
IUE spectrum for NGC 5139−UIT1425 together with model spectra for [M/H] = −1.5 (blue, Teff = 58 000 K) and [M/H] = 0 (red, Teff = 11 700 K). The model spectra were reddened by EB − V = 0.13, aligned to a radial velocity of +232 km s−1, and scaled to the observed flux between 1800 Å and 1900 Å. A hot star is clearly needed to reproduce the observed UV flux.
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