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

Context: Several hundred candidate hybrid pulsators of type A-F have beenidentified from space-based observations. Their large number allows bothstatistical analyses and detailed investigations of individual stars. Thisoffers the opportunity to study the full interior of the genuine hybrids, inwhich both low-radial-order p- and high-order g-modes are self-excited at thesame time. However, a few other physical processes can also be responsible forthe observed hybrid nature, related to binarity or to surface inhomogeneities.The finding that most delta Scuti stars also show long-period light variationsrepresents a real challenge for theory.  Methods: Fourier analysis of all the available Kepler light curves.Investigation of the frequency and period spacings. Determination of thestellar physical parameters from spectroscopic observations. Modelling of thetransit events.  Results: The Fourier analysis of the Kepler light curves revealed 55significant frequencies clustered into two groups, which are separated by a gapbetween 15 and 27 c/d. The light variations are dominated by the beating of twodominant frequencies located at around 4 c/d. The amplitudes of these twofrequencies show a monotonic long-term trend. The frequency spacing analysisrevealed two possibilities: the pulsator is either a highly inclined moderaterotator (v~70 km/s, i > 70 deg) or a fast rotator (v~200 km/s) with i~20 deg.The transit analysis disclosed that the transit events which occur with a ~197c/d period may be caused by a 1.6 R_Jup body orbiting a fainter star, whichwould be spatially coincident with KIC 9533489.

KIC 9533489: a genuine gamma Doradus-delta Scuti Kepler hybrid pulsator with transit events