Abstract
We present an analysis of the UV (IUE) spectra of the central stars of Hb7 and Sp3. Comparison with the IUE spectrum of the standard star HD 93205 leads to a spectral classication of O3V for these stars, with an eective temperature of 50 000 K. From the P-Cygni proles of CIV (1550 A), we derive stellar wind velocities and mass loss rates of 1317 km s 1 300 km s 1 and 2:9 10 8 M yr 1 and 1603 km s 1 400 km s 1 and 7 10 9 M yr 1 for Hb7 and Sp3 respectively. From all the available data, we reconstruct the spectral energy distribution of Hb7 and Sp3.
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