Time-scales of Line-broadening Variability in OB Supergiants

Details Time-scales of Line-broadening Variability in OB Supergiants Time-scales of Line-broadening Variability in OB Supergiants

2009-11-02

arxiv.org/abs/0911.0322v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

3 pages, 3 figures, 2 tables, Proceeding of the conference "Stellar pulsation: Challenges for theory and Observations" held in

Scientific paper

Several works have recently shown that there is an important extra line-broadening (usually called $macroturbulence$) affecting the spectra of O and B Supergiants that adds to stellar rotation. So far, the only (very recent) physical explanation for the appearance of $macroturbulence$ relates to oscillations. This is a plausible explanation, but no direct evidence confirming its validity has been presented yet. We recently started an observational project to obtain constraints on the time-scales of variability associated to this extra line-broadening and its possible origin. Our observational strategy consists of the study of a well selected group of O and B stars, for which we obtain time series of high-quality spectra. We present some preliminary results from our first campaign with FIES@NOT2.5m.

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