Title: Observational evidence for a correlation between macroturbulent broadening and line-profile variations in ob supergiants
Authors: Simon-Diaz, S ×
Herrero, A
Uytterhoeven, K
Castro, N
Aerts, Conny
Puls, J #
Issue Date: Sep-2010
Publisher: I O P Publishing Ltd.
Series Title: The Astrophysical Journal. Letters vol:720 issue:2 pages:L174-L178
Abstract: The spectra of O and B supergiants (Sgs) are known to be affected by a significant form of extra line broadening (usually referred to as macroturbulence) in addition to that produced by stellar rotation. Recent analyses of high-resolution spectra have shown that the interpretation of this line broadening as a consequence of large-scale turbulent motions would imply highly supersonic velocity fields in photospheric regions, making this scenario quite improbable. Stellar oscillations have been proposed as a likely alternative explanation. As part of a long-term observational project, we are investigating the macroturbulent broadening in O and B Sgs and its possible connection with spectroscopic variability phenomena and stellar oscillations. In this Letter, we present the first encouraging 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.
ISSN: 2041-8205
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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