Saio, H and Georgy, C and Meynet, G (2014) Stability boundaries for massive stars in the sHR diagram.

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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 $4\log T_{\rm eff}-\log g \,(= \log L/M)$. 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.

Item Type: Article
Uncontrolled Keywords: stars: evolution, stars: oscillations, stars: mass loss, Hertzsprung-Russell diagram
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 23 Apr 2015 09:58
Last Modified: 25 May 2016 10:31
URI: http://eprints.keele.ac.uk/id/eprint/431

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