Abstract
Aims. We discuss the status of the A-type component of the binary central star in the peculiar planetary nebula HD 149427. Methods. We acquired low and high spectral resolution optical spectroscopy for the range 4500−9000 A. Results. The analysis of the high resolution spectrum shows that the A-type star has an effective temperature of Teff = 8700 ± 150 K and a surface gravity of log g = 2.3 ± 0.4, corresponding to a spectral type A3-A4II. These parameters infer a luminosity estimate of log(L/L� ) = 3.69 ± 0.32, implying a distance of 10 ± 0.6 kpc. The A-type star is slightly metal-poor; barium and strontium, two key elements for monitoring the s-process nucleosynthesis, are not enriched; nitrogen is enriched relative to Sun; while carbon and oxygen are underabundant. The photospheric abundance of the A-type giant star in HD 149427 is compared with the abundance in other types of stars at different evolutionary stages.
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