Title: Is macroturbulent broadening in OB Supergiants related to pulsations?
Authors: Simon-Diaz, S ×
Uytterhoeven, K
Herrero, A
Castro, N
Puls, J
Aerts, Conny #
Issue Date: Dec-2010
Publisher: Wiley-v c h verlag gmbh
Series Title: Astronomische Nachrichten vol:331 issue:9-10 pages:1069-1072
Conference: 4th HELAS International Conference Canary Islands, SPAIN, FEB 01-05, 2010
Abstract: The spectrum of O and B Supergiants is known to be affected by an important extra line-broadening (usually called macroturbulence) that adds to stellar rotation. Recent analysis of high resolution spectra has shown that the interpretation of this line-broadening as a consequence of large-scale turbulent motions would imply highly super-sonic velocity fields, making this scenario quite improbable. Stellar oscillations have been proposed as a likely alternative explanation. We present first encouraging results of an observational project aimed at investigating the macroturbulent broadening in O and B Supergiants, and its possible connection with spectroscopic variability phenomena and stellar oscillations: a) all the studied B Supergiants show line profile variations, quantified by means of the first (< v >) and third velocity (< v(3)>) moments of the lines, b) there is a strong correlation between the peak-to-peak amplitudes of the < v > and < v(3)> variability and the size of the extra-broadening. (C) 2010 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim
ISSN: 0004-6337
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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