In article , jacobnavia
writes:

Le 19/05/2018 =E0 11:09, Phillip Helbig (undress to reply) a =E9crit :
The star mentioned above has oxygen, what implies at least several
generations of stars to produce it,
Why? One generation will produce oxygen.

Yes, but when the star explodes that oxygen will be enormouly diluted in
the surrounding gas...
To make an oxygen signal visible 13 Gy away the concentration of oxyygen
should be quite high.

Are you just making this up or did you get it from somewhere? Note also
that the first stars might have been VERY massive, producing
correspondingly more oxygen (no, I am not just making this up).