Abstract
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 language | English |
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Pages (from-to) | 230-231 |
Number of pages | 2 |
Journal | Proceedings of the International Astronomical Union |
Volume | 9 |
DOIs | |
Publication status | Published - 2014 |
Externally published | Yes |
Keywords
- Hertzsprung-Russell diagram
- stars: evolution
- stars: mass loss
- stars: oscillations
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science