In our previous work (Montes et al. 2018) we have established a sample of 192 physically bound systems made of late-F, G-, or early-K primaries and late-K or M dwarf companion. For 173 primaries of these systems we have derived precise stellar atmospheric parameters: Teff, log g, Vmicro, and chemical abundances for 13 atomic species, including [Fe/H]. Using this information of the primaries and the spectral indices derived from CAFOS/2.2m (CAHA) low-resolution spectra and photometry in different bands of the M-dwarf companions we have derived several calibrations.

Poster contribution at "The 20th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun", July 29 - Aug 3, 2018 Boston / Cambridge, USA. Acknowledgements: This research is partially supported by the Universidad Complutense de Madrid (UCM), the Spanish Ministerio de Economía y Competitividad (MINECO) from project AYA2016-79425-C3-1,2-P

{"references": ["Montes et al. 2018: 2018MNRAS.479.1332M http://cdsads.u-strasbg.fr/abs/2018MNRAS.479.1332M", "Alonso-Floriano et al. 2015, A&A, 577, A128 http://cdsads.u-strasbg.fr/abs/2015A%26A...577A.128A", "Tabernero et al. 2012A&A...547A..13T http://cdsads.u-strasbg.fr/abs/2012A%26A...547A..13T"]}