English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

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

Time-scales of Line-broadening Variability in OB Supergiants