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Initial C/O ratios of circumstellar disks have been obtained in solar-typestars by differential photospheric abundance analysis with respect to the Sun.We present C/O ratios of M dwarfs obtained by absolute abundance analysisderived from CO and H2O spectra in the K-band. We compare the distributions ofC/O ratios in M dwarfs and solar-type stars using the Kolmogorov-Smirnov test.The C/O distribution of M dwarfs is consistent with low frequency of high C/Oratios in solar-type stars.

Carbon-to-Oxygen Ratios in M dwarfs and Solar-type stars