Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-23T14:38:52.243Z Has data issue: false hasContentIssue false
  • English
  • Français

Stability boundaries for massive stars in the sHR diagram

Published online by Cambridge University Press:  23 January 2015

Hideyuki Saio ,
Cyril Georgy  and
Georges Meynet
Hideyuki Saio
Affiliation:
Tohoku University, Japan email: [email protected]
Cyril Georgy
Affiliation:
Keele University, UK
Georges Meynet
Affiliation:
Geneva observatory, Switzerland
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 Teff - 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.

Keywords

stars: evolutionstars: oscillationsstars: mass lossHertzsprung-Russell diagram
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 230 - 231
Copyright
Copyright © International Astronomical Union 2015 

References

Bresolin, F., Pietrzyński, G., Gieren, W., et al. 2004, ApJ 600, 182CrossRefGoogle Scholar
Ekström, S., Georgy, C., Eggenberger, P., et al. 2012, A&A 537, A146Google Scholar
Firnstein, M. & Przybilla, N. 2012, A&A 543, A80Google Scholar
Kudritzki, R.-P., Urbaneja, M. A., Bresolin, F., et al. 2008, ApJ 681, 269Google Scholar
Langer, N. & Kudritzki, R. P. 2014, A&A 564, A52Google Scholar
Saio, H., Georgy, C., & Meynet, G. 2013, MNRAS 433, 1246Google Scholar