Carbon-to-Oxygen Ratios in M dwarfs and Solar-type stars
Tadashi Nakajima, Satoko Sorahana
TL;DR
This study compares carbon-to-oxygen ratios in M dwarfs and solar-type stars using spectral analysis, revealing similar distributions and a low occurrence of high C/O ratios in both star types.
Contribution
It introduces a method for determining C/O ratios in M dwarfs via spectral analysis and compares these with solar-type stars, expanding understanding of stellar compositions.
Findings
C/O ratios in M dwarfs are similar to those in solar-type stars.
Low frequency of high C/O ratios observed in both star types.
Spectral analysis effectively determines stellar C/O ratios.
Abstract
Initial C/O ratios of circumstellar disks have been obtained in solar-type stars by differential photospheric abundance analysis with respect to the Sun. We present C/O ratios of M dwarfs obtained by absolute abundance analysis derived from CO and H2O spectra in the K-band. We compare the distributions of C/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/O ratios in solar-type stars.
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