To revisit the long-standing problem of possible inconsistency concerning the oxygen composition in the current galactic gas and in the solar atmosphere ( i.e. , the former being appreciably lower by \sim 0.3 dex ) apparently contradicting the galactic chemical evolution , we carried out oxygen abundance determinations for 64 mid- through late-B stars by using the O i 6156–8 lines while taking into account the non-LTE effect , and compared them with the solar O abundance established in the same manner .
The resulting mean oxygen abundance was \langle A ^ { O } \rangle = 8.71 ( \pm 0.06 ) , which means that [ O/H ] ( star - Sun differential abundance ) is \sim - 0.1 , the difference being less significant than previously thought .
Moreover , since the 3D correction may further reduce the reference solar oxygen abundance ( 8.81 ) by \sim 0.1 dex , we conclude that the photospheric O abundances of these B stars are almost the same as that of the Sun .
We also determined the non-LTE abundances of neon for the sample B stars from Ne i 6143/6163 lines to be \langle A ^ { Ne } \rangle = 8.02 ( \pm 0.09 ) , leading to the Ne-to-O ratio of \sim 0.2 consistent with the recent studies .
This excludes a possibility of considerably high Ne/O ratio once proposed as a solution to the confronted solar model problem .