Gaia FGK benchmark stars: new candidates at low metallicities K. Hawkins, P. Jofré, U. Heiter, C. Soubiran, S. Blanco-Cuaresma, L. Casagrande, G. Gilmore, K. Lind, L. Magrini, T. Masseron et al. (3 more) A&A, 592 (2016) A70 Published online: 28 July 2016 DOI: 10.1051/0004-6361/201628268