Fig. 10
Comparison between ON and non-ON fast-rotating stars. Left: log(N/C) vs. log(N/O) diagram. Right: log g–log(Teff) diagram. Large symbols are ON stars from the present study; open/small symbols are fast rotating stars (V sin i> 250 km s-1) from Martins et al. (2015). The star ζ Oph is also included: effective temperature and surface gravity are from Martins et al. (2015), and surface abundances are from Villamariz & Herrero (2005).
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