Skip to main content Accessibility help
×
Home

3D MHD simulations of subsurface convection in OB stars

  • Matteo Cantiello (a1), Jonathan Braithwaite (a1), Axel Brandenburg (a2) (a3), Fabio Del Sordo (a2) (a3), Petri Käpylä (a2) (a4) and Norbert Langer (a1)...

Abstract

During their main sequence evolution, massive stars can develop convective regions very close to their surface. These regions are caused by an opacity peak associated with iron ionization. Cantiello et al. (2009) found a possible connection between the presence of sub-photospheric convective motions and small scale stochastic velocities in the photosphere of early-type stars. This supports a physical mechanism where microturbulence is caused by waves that are triggered by subsurface convection zones. They further suggest that clumping in the inner parts of the winds of OB stars could be related to subsurface convection, and that the convective layers may also be responsible for stochastic excitation of non-radial pulsations. Furthermore, magnetic fields produced in the iron convection zone could appear at the surface of such massive stars. Therefore subsurface convection could be responsible for the occurrence of observable phenomena such as line profile variability and discrete absorption components. These phenomena have been observed for decades, but still evade a clear theoretical explanation. Here we present preliminary results from 3D MHD simulations of such subsurface convection.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      3D MHD simulations of subsurface convection in OB stars
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      3D MHD simulations of subsurface convection in OB stars
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      3D MHD simulations of subsurface convection in OB stars
      Available formats
      ×

Copyright

References

Hide All
Belkacem, K., Samadi, R., Goupil, M.-J., Lefèvre, L. et al. 2009, Science, 324, 1540
Brandenburg, A., Chan, K. L., Nordlund, Å., & Stein, R. F. 2005, AN, 326, 681
Cantiello, M., Langer, N., Brott, I., de Koter, A. et al. 2009, A&A, 499, 279
Degroote, P., Briquet, M., Auvergne, M., Simón-Díaz, S. et al. 2010, A&A, 519, A38
Eichler, D., Bar Shalom, A., & Oreg, J. 1995, ApJ, 448, 858
Evans, C., Smartt, S., Lennon, D., Dufton, P. et al. 2005, The Messenger, 122, 36
Fraser, M., Dufton, P. L., Hunter, I., & Ryans, R. S. I. 2010, MNRAS, 404, 1306
Goldreich, P. & Kumar, P. 1990, ApJ, 363, 694
Heger, A. & Langer, N. 1996, A&A, 315, 421
Kaper, L. & Henrichs, H. F. 1994, Ap&SS, 221, 115
Käpylä, P. J., Korpi, M. J., & Brandenburg, A. 2008, A&A, 491, 353
Kato, M. & Iben, I. Jr. 1992, ApJ, 394, 305
Lépine, S. & Moffat, A. F. J. 1999, ApJ, 514, 909
Marchenko, S. V., Moffat, A. F. J., St-Louis, N., & Fullerton, A. W. 2006, ApJ (Letters), 639, L75
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

3D MHD simulations of subsurface convection in OB stars

  • Matteo Cantiello (a1), Jonathan Braithwaite (a1), Axel Brandenburg (a2) (a3), Fabio Del Sordo (a2) (a3), Petri Käpylä (a2) (a4) and Norbert Langer (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed