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Is macroturbulence in OB Sgs related to pulsations?

Published online by Cambridge University Press:  12 July 2011

Sergio Simón-Díaz ,
Artemio Herrero ,
Katrien Uytterhoeven ,
Norberto Castro ,
Conny Aerts  and
Joachim Puls
Sergio Simón-Díaz
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
Artemio Herrero
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
Katrien Uytterhoeven
Affiliation:
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot; CEA, IRFU, SAp, centre de Saclay, 91191, Gif-sur-Yvette, France
Norberto Castro
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
Conny Aerts
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium IMAPP, Department of Astrophysics, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlands
Joachim Puls
Affiliation:
Universitätssternwarte München, Scheinerstr. 1, 81679 München, Germany
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Abstract

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As part of a long term observational project, we are investigating the macroturbulent broadening in O and B supergiants (Sgs) and its possible connection with spectroscopic variability phenomena and stellar oscillations. We present the first results of our project, namely firm observational evidence for a strong correlation between the extra broadening and photospheric line-profile variations in a sample of 13 Sgs with spectral types ranging from O9.5 to B8.

Keywords

stars: early-typestars: atmospheresstars: oscillationsstars: rotationsupergiants
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 549 - 550
Copyright
Copyright © International Astronomical Union 2011

References

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Simón-Díaz, S., Herrero, A., Uytterhoeven, K., Castro, N. et al. 2010, ApJ (Letters), 720, L174CrossRefGoogle Scholar