  Simultaneous analysis of the C_2 and CN molecular bands in the 5100-5200 and
7930-8100A spectral regions is a promising alternative for the accurate
determination of the carbon (C) and nitrogen (N) abundance in the atmospheres
of the solar-like stars. Practical implementation of this new method became
possible after recent improvements of the molecular constants for both
molecules. The new molecular data predicted the correct line strength and line
positions; therefore, they were included in the Vienna Atomic Line Database
(VALD), which is widely used by astronomers and spectroscopists. In this paper,
we demonstrate that the molecular data analysis provides C and, in particular,
N abundances consistent with those derived from the atomic lines. We illustrate
this by performing the analysis for three stars. Our results provide strong
arguments for using the combination of C_2 and CN molecular lines for accurate
nitrogen abundance determination keeping in mind the difficulties of using the
N1 lines in the observed spectra of the solar-like stars.
