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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The analysis of a dense time-series on V974 Oph disclosed the richpulsational content (at least five independent terms) of this high-amplitude(0.60 mag in B-light) Delta Sct star. A mode with a frequency very close to themain one (probably the fundamental radial mode) has been detected: such adoublet is not a common feature in stars of the same class. Also another termcan be considered a radial one, but the high ratio (0.786) raises some problemsthat can be solved only by admitting very low metallicity. It is quite evidentthat some undetectable terms are again hidden in the noise, as theleast--squares fit leaves a rms residual much higher than the observationalnoise. All that considered, nonradial modes seem to play a key role in thelight variability of V974 Oph. Revealing an unsuspected asteroseismic interest,V974 Oph provides a link between low- and high-amplitude Delta Sct stars. Bydiscussing other high-amplitude Delta Sct stars showing unusual period ratios,it is evident that the asteroseismic approach is possible also for this classof pulsators.Comment: 6 pages, 5 figures. Accepted for publication in Astronomy &  Astrophysic

Asteroseismology of HADS stars: V974 Oph, a radial pulsator flavoured by nonradial components