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In the framework of the Stellar Population Astrophysics (SPA) project, wepresent new observations and spectral analysis of four sparsely studied openclusters, namely Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171. Weexploit the HARPS-N spectrograph at the TNG telescope to acquirehigh-resolution optical spectra for 15 member stars of four clusters. We derivestellar parameters using both the EW analysis and the spectral fittingtechnique. We compute elemental abundances for light, a-, iron-peak, andn-capture elements using the EW measurement approach. We investigate the originof the correlation between metallicity and stellar parameters derived with theEW method for the coolest stars of the sample (Teff < 4300 K). The correlationis likely due to the challenging continuum setting and to a general inaccuracyof model atmospheres used to reproduce the conditions of very cool giant stars.We locate the properties of our clusters in the radial distributions ofmetallicity and abundance ratios, comparing our results with clusters from theGaia-ESO and APOGEE surveys. We present the [X/Fe]-[Fe/H] and [X/Fe]-Rgc trendsfor elements in common between the two surveys and derive the C and Liabundances as a function of the evolutionary phase and compare them withtheoretical models. The SPA survey allows us to fully characterise thechemistry of nearby clusters. With a single set of spectra, we provide chemicalabundances for some chemical elements, which are comparable to those obtainedin two of the largest surveys combined. The metallicities and abundance ratiosof our clusters fit very well in the radial distributions defined by the recentliterature, reinforcing the importance of star clusters to outline the spatialdistribution of abundances in our Galaxy. Moreover, the abundances of C and Liagree with evolutionary prescriptions for their masses and metallicities.

Stellar Population Astrophysics (SPA) with TNG. The old open clusters Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171