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 relation of period spacing ($\Delta P$) versus period ($P$) of dipoleprograde g modes is known to be useful to measure rotation rates in the g-modecavity of rapidly rotating $\gamma$ Dor and slowly pulsating B (SPB) stars. Ina rapidly rotating star, an inertial mode in the convective core can resonantlycouple with g modes propagative in the surrounding radiative region. Theresonant coupling causes a dip in the $P$-$\Delta P$ relation, distinct fromthe modulations due to the chemical composition gradient. Such a resonance dipin $\Delta P$ of prograde dipole g modes appears around a frequencycorresponding to a spin parameter $2f_{\rm rot}{\rm(cc)}/\nu_{\rm co-rot} \sim8-11$ with $f_{\rm rot}$(cc) being the rotation frequency of the convectivecore and $\nu_{\rm co-rot}$ the pulsation frequency in the co-rotating frame.The spin parameter at the resonance depends somewhat on the extent of coreovershooting, central hydrogen abundance, and other stellar parameters. We canfit the period at the observed dip with the prediction from prograde dipole gmodes of a main-sequence model, allowing the convective core to rotatedifferentially from the surrounding g-mode cavity. We have performed suchfittings for 16 selected $\gamma$ Dor stars having well defined dips, and foundthat the majority of $\gamma$ Dor stars we studied rotate nearly uniformly,while convective cores tend to rotate slightly faster than the g-mode cavity inless evolved stars.

Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes