Is macroturbulence in OB Sgs related to pulsations?
S. Sim\'on-D\'iaz, A. Herrero, K. Uytterhoeven, N. Castro, C. Aerts,, and J. Puls
TL;DR
This study investigates whether macroturbulent broadening in OB supergiants is linked to stellar pulsations, providing observational evidence of a correlation between line-profile variations and broadening.
Contribution
It presents the first observational evidence connecting macroturbulent broadening with spectroscopic variability in OB supergiants.
Findings
Strong correlation between line-profile variations and broadening.
Evidence supports pulsations as a cause of macroturbulence.
Sample includes 13 supergiants from O9.5 to B8.
Abstract
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.
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