Photometric evidence for two-temperature photospheric inhomogeneities on magnetically active K dwarf starsS. Messina, G. Cutispoto, E. F. Guinan, A. F. Lanza and M. RodonòA&A, 447 1 (2006) 293-297DOI: https://doi.org/10.1051/0004-6361:20054005