These are stars with initial masses between 0.8 and 8 solar masses in the late stages of their lives. (alma-telescope.jp)
Smith, N., Li, W., Filippenko, A. V. & Chornock, R. Observed fractions of core - collapse supernova types and initial masses of their single and binary progenitor stars. (nature.com)
The team used detailed analyses of about 250 stars with masses between 15 and 200 times the mass of our Sun to determine the distribution of massive stars born in 30 Doradus — the so - called initial mass function (IMF). (sciencedaily.com)