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Highly precise temperatures (sigma = 10-15 K) have been determined from linedepth ratios for a set of 248 F-K field dwarfs of about solar metallicity (-0.5< [Fe/H] < +0.4), based on high resolution (R=42000), high S/N echelle spectra.A new gap has been discovered in the distribution of stars on the Main Sequencein the temperature range 5560 to 5610 K. This gap coincides with a jump in themicroturbulent velocity Vt and the well-known Li depression near 5600 K infield dwarfs and open clusters. As the principal cause of the observeddiscontinuities in stellar properties we propose the penetration of theconvective zone into the inner layers of stars slightly less massive than theSun and related to it, a change in the temperature gradient.Comment: 5 pages, 2 figures, 1 electronic table, in press in A&

A new Böhm-Vitense gap in the temperature range 5560 to 5610 K in the main sequence