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HD172189 is a spectroscopic eclipsing binary system with a rapidly-rotatingpulsating delta Scuti component. It is also a member of the open clusterIC4756. These combined characteristics make it an excellent laboratory forasteroseismic studies. To date, HD172189 has been analysed in detailphotometrically but not spectroscopically. For this reason we have compiled aset of spectroscopic data to determine the absolute and atmospheric parametersof the components. We determined the radial velocities (RV) of both componentsusing four different techniques. We disentangled the binary spectra usingKOREL, and performed the first abundance analysis on both disentangled spectra.By combining the spectroscopic results and the photometric data, we obtainedthe component masses, 1.8 and 1.7 solar masses, and radii, 4.0 and 2.4 solarradii, for inclination i = 73.2 degrees, eccentricity e = 0.28, and orbitalperiod 5.70198 days. Effective temperatures of 7600 K and 8100 K were alsodetermined. The measured vsini are 78 and 74 km/s, respectively, givingrotational periods of 2.50 and 1.55 days for the components. The abundanceanalysis shows [Fe/H] = -0.28 for the primary (pulsating) star, consistent withobservations of IC4756. We also present an assessment of the different analysistechniques used to obtain the RVs and the global parameters.

HD172189: another step in furnishing one of the best laboratories known for asteroseismic studies