http://abyss.uoregon.edu/~js/ast122/lectures/lec18.html [Архівовано 2020-02-14 у Wayback Machine.] "Stars greater than 25 solar masses undergo a more violent end to their lives. Carbon core burning lasts for 600 years for a star of this size. Neon burning for 1 year, oxygen burning about 6 months (i.e. very fast on astronomical timescales)" (англ.)
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http://abyss.uoregon.edu/~js/ast122/lectures/lec18.html [Архівовано 2020-02-14 у Wayback Machine.] "Stars greater than 25 solar masses undergo a more violent end to their lives. Carbon core burning lasts for 600 years for a star of this size. Neon burning for 1 year, oxygen burning about 6 months (i.e. very fast on astronomical timescales)" (англ.)