Stability boundaries for massive stars in the sHR diagram

Hideyuki Saio, Cyril Georgy, Georges Meynet

Research output: Contribution to journalArticlepeer-review


Stability boundaries of radial pulsations in massive stars are compared with positions of variable and non-variable blue-supergiants in the spectroscopic HR (sHR) diagram (Langer & Kudritzki 2014), whose vertical axis is 4 log T eff-log g(= log L/M). Observational data indicate that variables tend to have higher L/M than non-variables in agreement with the theoretical prediction. However, many variable blue-supergiants are found to have values of L/M below the theoretical stability boundary; i.e., surface gravities seem to be too high by around 0.2-0.3 dex.

Original languageEnglish
Pages (from-to)230-231
Number of pages2
JournalProceedings of the International Astronomical Union
Publication statusPublished - 2014
Externally publishedYes


  • Hertzsprung-Russell diagram
  • stars: evolution
  • stars: mass loss
  • stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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