Abstract
The distribution of massive stars in the HR Diagram (HRD) is characterized by the following main features:
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a)
a group of very luminous O-type stars, next to the ZAMS;
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b)
an upper limit to the luminosity of blue and yellow supergiants, which is decreasing with decreasing effective temperature and which ends up with the lack of M supergiants brighter than M≃ −9.5;
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c)
an almost continous distribution of blue supergiants, up to the spec tral type AO (Humphreys 1981).
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Greggio, L. (1984). Nucleosynthesis During the Quasi-Static Evolution of Massive Stars. In: Chiosi, C., Renzini, A. (eds) Stellar Nucleosynthesis. Astrophysics and Space Science Library, vol 109. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6348-1_12
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DOI: https://doi.org/10.1007/978-94-009-6348-1_12
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